Interview with Frank Veldman from Sunworld.
Every year I receive the same questions: Which sunscreen is best to use? Should you apply it all year round? Do I get wrinkles from the sun? What can I do about hyperpigmentation? Every time, I struggle to find the right answers because the deeper you dive into the world of the sun, the more contradictions you will come across.
This year, one of my clients came in with the most beautiful tan. I asked her if it was real or if this colour came out of a jar. "It’s real", she said laughing, "I practice sun training". I had heard this term already a few times before and it always leads to: Frank Veldman!
Frank, a whistle-blower/pioneer in the field of the sun, has been sharing a very uncommon story for years. He has researched and developed his own vision when it comes to our interactions with the sun. And, spoiler alert, I like his vision a lot! That’s why I decided to interview him and ask him all of the questions mentioned above, and more.
Let's start with a quote from Frank: "I am not asking for people to believe me, but just to hear what I have to say".
You have been in active in this field for 29 years and you have a ton of knowledge and experience. Tell us, who is Frank Veldman and what does sunlight mean to you?
Light is life. Light gives energy. We can have great health benefits when we are dealing with the sun in a correct way. For 29 years I have been exposing people to light and observe what it does to them. Cosmetically in terms of colour but light does so much more than we realise! I practice my job with great pleasure. I have the passion of seeing people, hearing them, reading them. This all takes place in my UV-health centre in Valkenswaard (Netherlands). It is my mission to find out the truth behind the sun and the tanning bed.
You have a very unique tanning studio/a "UV-health centre". People relate to the word tanning bed by often thinking that it’s bad for them. You have a different perception. Can you tell us something about it?
The advantage of a tanning bed is that you can measure and dose the intensity very precisely. The sun outside is more variable, think of clouds, sand or water in the surroundings. The advice from the health council in the Netherlands is that we should get enough Vitamin D by spending enough time unprotected in the sun. As soon as you've applied sunscreen, you produce little or no Vitamin D at all anymore! UVB radiation is responsible for the production Vitamin D. Your skin can hardly distinguish the difference between a UVB lamp and the sun. In principle, they have the same frequency.
The advice in 1995 was that you could be in the sun with sunscreen for a maximum of 2 hours. Now the advice is that as long as you apply sunscreen, it does not matter how long you stay in the sun.
In 2007, the lamps of tanning beds had to be adjusted because of stricter requirements. Suddenly, tanning beds were linked to skin cancer. For me it is very simple, if I was selling skin cancer, I would be the first to quit. The tanning beds used to have stronger UVB lamps. This resulted in a faster production of vitamin D. Now the lamps are weaker and one has to lie under them longer to produce the same amount of Vitamin D. Back in the days, a dermatologist would say; tanning beds are bad because they are too strong. Now a dermatologist says; tanning beds are bad because they contain too little UVB. All of this immediately became a quest for me. I started wondering why these contradictions were there and how skin cancer occurs. I started to investigate, asking questions, meeting a lot of interesting people but the closer I got to the truth, the more I found myself in front of closed doors.
My clients and followers can expect from me that I’ll advise them properly. Over the years, I have seen what light can do to people. Especially in winter, I mainly get skin type 3 people in the studio. This type of people have a naturally darker skin and therefore need more light to produce Vitamin D for example. Their roots lie in a sunny country but the Netherlands has very different conditions. If this group does not get enough sun, all kinds of health problems arise. The tanning bed can then offer a solution.
What makes your studio, Sun World, so special?
I combine health and light. In our centre, we expose the body to light and let people experience what it can do for them. My team looks at the human being in a holistic way. We literally look at people's skin. By now I have so much experience in this myself that I can exactly see which skin has used sunscreen during the summer and which skin has been sun trained. That colour is so different. We also ask a lot of questions. Sometimes an intake takes up to 45 minutes. We want to know what is going on with someone. Why does someone come to us, what does this person need and why does that need matter? What is someone missing, what is someone lacking?
With our tanning beds, we try as much as possible to mimic the full light spectrum of the sun. In this way, we try to be an alternative to the sun. The choice of what kind of light to use is always made in consultation with the client. We adjust the light spectrum to what someone needs for their health. We do that with UV light but also with red, green or yellow light for instance. We also supply customised tanning beds, fully customised for what the client needs. Tanning is a nice benefit but that is not our point of focus. We mainly focus on health.
You read a skin, what are you looking at? What do you do with this information?
The skin communicates with us. The colour but also every mark means something. I look at that skin. If I can’t see it well because someone is wearing make-up for example, I ask if they can remove it. And that too means something, why does someone want to hide their skin under a thick layer? Then you actually know right away, something is going on there. Other questions include: Who are you, what is your goal, what is your past, what is your experience, what would you like to experience/achieve?
Every skin type has about 4 colour gradations. The parts like your head and hands, for example, have a completely different colour as where your bikini is. That skin also tells a message. From this, I can actually see how much light a skin can really tolerate, how strong a lamp can be and the maximum duration someone can stay under a tanning bed. If you then keep asking questions, you can also learn a lot about a person through their posture, their voice, whether they are energetic or tired. How does someone live, what is their eating pattern? All this information indicates which colours of light someone needs. I try to read the imbalance in a system and try to optimise it back.
From all the information we collect, we create a file for everyone coming to us for a light therapy. That way, we can keep track of whether our approach is working or needs adjusting. Over the years, we have helped more than one and a half million people and I am convinced that light does people an enormous amount of good.
In your opinion, can everyone be in the sun or use a tanning bed?
Everyone can be in the sun. Even people with red hair and freckles or people who say they will burn alive in the sun. That skin just needs a different approach but even that skin can get a tan. Once in a while it does happen that a skin behaves differently. Usually this indicates a blockage in the system. In such occasions I would then refer someone to a health professional in my network. There the person receives then further guidance.
Since you are the only one in the Netherlands with such a unique studio, what should people ask/look out for when they go to a tanning studio?
Ask what kind of lamps are in the tanning bed. What is the ratio of UVA/UVB light in the lamp. The key is to get the right light dosage on the current skin status. Getting advice/guidance as well as the right range/dosage is essential.
When we enter autumn and then winter, the sun and sun power are decreasing. What is the best thing to do then?
The theory is that if you have spent enough time in the sun during spring and summer, producing Vitamin D in this way, then you should be good until approximately March. This theory is based on a government statement that you should spend 15 minutes a day in the sun with your head, neck and hands unprotected at a UV Index 7. But in practice, it does not seem to work that way. Every year Vitamin D deficiencies are measured. We spend far too little time outside, and UV Index 7 hardly ever occurs in our country.
Keep a close eye on yourself and explore your options. With some extra light, you can get through the dark months in a pleasant way. It also prevents extreme sun behaviour in spring because you then crave less (sun)light.
What are alarm bells in terms of appearance/behaviour by which you can tell that someone needs more light?
Signs could include very dry skin, eczema, psoriasis, back pain, muscle aches, very pale skin or if you have skin type 3 or 4. But also fatigue, having no energy or when you don’t want to get up in the morning. Some people are empty, they are completely exhausted. To someone who feels very low in energy, I give an energy dose of light. This helps because when your energy gets restored, you can take better care of yourself again. Everything starts to flow again. You feel better and you regain the strength to cook and make healthier choices. An energetic body makes very different lifestyle choices than a drained body. Everything is connected.
Does a daylight lamp have the same effect?
In my opinion it does not, or at least not enough. It is much more effective to just go outside. If you can’t do that, a daylight lamp is an alternative. Doing something is better than doing nothing, at least for your mood. But when it comes to Vitamin D production, you will need those UVB rays anyway.
Many people take Vit D in the colder months. How do you feel about supplementing Vit D?
The best way to make Vit D is through the skin. All parties agree on that and that’s exactly what I can help you with. Taking a Vitamin D supplement with it is a choice. I leave that up to you.
It is often said that you should apply sunscreen all year round, regardless of whether you are indoors or out in the rain. What do you think of this advice?
When dealing with the sun properly, sunscreen is usually no longer necessary. The sun is not bad, the sun is nature. Our behaviour towards the sun is not right, that’s what we have to look into.
Science bases its vitamin D advice on a UV Index 7 and states that we should be protected with sunscreen at all time. At the same time, the advice of the Dutch health council is that we must produce enough Vitamin D by being unprotected in the afternoon sun. That is very contradictory. Also, a UV Index 7 is not very common in the Netherlands. Our summers are usually between 5 and 6. There’s no UV light yet in the early morning. It slowly rises during the morning. Children must be already get protected with sun cream at 8am and this must be done every 2 hours. Because children are still growing and their bones still need to become strong, they then miss every opportunity to produce Vitamin D. I worry about the strength of their skeleton. And add to that some blue light all day long from using computers, iPads and mobile phones, that makes me genuinely worried. Your brain then thinks all day long that it's about 2pm, which affects your natural day/night rhythm. Hopefully there will be more and more attention from schools and day care centres to deal with this differently. For instance, there could be both sun and shade areas for children to play. It is precisely there that correct sun behaviour is so incredibly important, start young with the proper behaviour. Fortunately, the first day care centres have contacted me. It is not up to me to persuade people, stay critical yourself, ask questions, confront your teacher/supervisor or doctor with data. You will see that they cannot help but draw the same conclusion as I have.
How do you feel about sunscreen and harmful rays (UVA and UVB)?
Sunscreen gives a false sense of security. Advertisements insinuate that you can still get a "nice tan" with factor 50. And that's what we want, to get a nice tan. But if you can still get a nice tan with factor 50, this indicates that radiation gets through the sunscreen, otherwise you wouldn't be able to tan at all. So how much radiation is that exactly? These are questions you could ask your sunscreen brand. Nor does it say anywhere on the packaging how much, how often, by which UV index or when you should apply sun cream.
The sun has got more UVA than UVB. UVA is called the aging factor and it penetrates the skin the deepest. UVA provides instant tanning. You do have to spend a long time in the sun to get that tan. UVA does not give a proper tan. Also, UVA is partly responsible for the development of skin cancer. Many people do not know that sunscreen is allowed to have a permeability to UVA. By applying sunscreen, you block the UVB rays while the UVA rays still come through. In this case you get a tan with UVA! Then another confusing thing happens because by using sunscreen we visually don’t get a sunburn but yet, soon after our holiday ends, the peeling process starts. This indicates that skin damage has occurred. The skin has been drained; it has become completely dry.
UVB goes a little less deep into the skin and it takes longer to get a tan. UVB takes care of Vitamin D production. UVB is healthier.
Sunscreen that leaves a white layer on the skin protects you best. Once you can no longer see the layer, it means it has been absorbed by your skin and the product is in your bloodstream.
Women in particular are very sensitive to anything related to (skin) ageing. Are you under the impression that correct sun behaviour (more on this in a moment) makes wrinkles and lines worse?
When skin is handled correctly in the sun, the skin actually gets better. Prepare your skin for the UV light of the afternoon with the morning and evening sun. At these times, there is mainly just red light present. This is super healing for the skin, has an anti-inflammatory effect and actually helps reduce wrinkles! In this way, nature automatically already provides the right balance for healthy sun exposure.
How can we make sure that we stay hydrated in the sun? Are there things you should absolutely NOT do when tanning?
It's really all about tanning behaviour. What do we do? We sit indoors all year. Then we go on holiday to a sunny country. Don't forget that this is also a different climate, maybe there is a reflection from sand, water or snow and there is often a higher UV Index than in the Netherlands. We look forward to the sun holiday, finally some light and warmth, we’re CRAVING for it because we have been sitting inside for so long. Then we suddenly spend our whole day in the sun, albeit with sunscreen, and think we are safe. We also tend to eat more unhealthy food and drink more alcohol during our holiday. These are all circumstances that suddenly put a huge strain on our skin. On top of that, we have not prepared our skin by going to a tanning centre. So that skin faces a peak load on holiday, it goes crazy! It is precisely those peak loads that often cause skin cancer, 95% of all skin cancers probably come from peak loads during sun holidays.
Where is hydration in this whole story? There is also nobody talking about "resting after exposure". Our skin can handle sunlight as long as it is built up gradually, if it is given rest to recover. Adapting is how we call it. If you build this up very gradually/slowly from spring onwards, you get a completely different skin. Not just in terms of colour but especially in terms of protection. That tan actually provides sun protection. You could compare this to an SPF between 4 and 6. Eating lots of vegetables and fruits so that you provide your system with the right minerals is also not recommended anywhere. Whether you are acidified or mineralised makes a big difference. This is so important for the body's self-healing ability.
In sunny countries (where by the way, skin cancer is the least common), they talk about "avoid, cover, sunscreen". In other words; seek the shade, cover yourself or, if there's really no other way, use sunscreen. What we do is turning this around: sunscreen, cover, avoid, and the last two hardly even happen anymore because of applying sunscreen.
I saw photos on your IG account of pigment spots that have become LESS due to correct sun behaviour. How do you explain this? How do you view pigmentation spots?
Pigment spots always come with a story. Unfortunately, there is no easy answer to that. The most important thing is to gather information and listen to your client's story. What many people think is that they are caused by the sun, but in practice we rather think that it is caused from within us. The sun only lights up the stain. So the task is to dive on the inside. We actually think that intensive SPF use is more likely to cause the chance of getting pigment spots. The body is polluted daily with all the ingredients in these cosmetics. So the body has to fight every day to get rid of these waste products. The cell becomes polluted and weakened in its function.
How can we best start preparing for spring? Is that when you start sun training?
As soon as the sun regains some strength, you can start sun training. So then you build it up very slowly.
What could we do better/what is right with regards to sun behaviour? How should we handle a sunny day? What does such a day look like?
The sun affects so many processes in our bodies. If you look at the Circadian rhythm, you will see that a day consists of mostly red light, purple light, and red light again. I always have breakfast outside unless it is raining or snowing. My brain then immediately gets information from the morning light. The light must be able to come into your eyes. By this I don't mean that you have to look straight into the sun but, for example, wearing (sun)glasses or lenses already blocks this light. In the morning and evening, we get a lot of red light. This is super healing on many levels, just look into it. Between noon and 2pm, we get the strongest dose of UVB light. This is the time when you want to expose yourself unprotected for optimal vitamin D production.
The more the sun gets to your uncovered/unprotected skin, the faster your Vitamin D production. Once you have spent in the sun the number of minutes that suits your skin type, give your skin a rest. That means no sun for 1 or 2 days. Then you continue to build up again. You build up the number of minutes that you can be unprotected in the sun. By the time summer arrives, your skin will be able to tolerate UV light so well that by then you might be able to be outside unprotected for a few hours. How nice is that! No more applying sunscreen, no more unnecessary or harmful substances in your bloodstream, you can do this all by yourself. And otherwise, go in the shade or put on some clothes. That is what sun behaviour is about.
People who have experienced this don't want to go back. They feel better, more vigorous, more energetic and they get sick less often. And all because of the sun, how beautiful is that!
You have come up with a formula for this, how can people apply it? Is this formula applicable to everyone (children/older people)? Would you like to share your formula? Where can people find out about this?
Check what your skin type is. We stick to 4 skin types. You can look up which skin type you are here (page in Dutch). The unprotected sun exposure time for skin type 1 = 67, for skin type 2 = 100, skin type 3 = 200, skin type 4 = 300. Divide that number by the sun power (UV Index) and then you can calculate exactly how long you can be in the sun. As an example: You have skin type 2, with this comes the unprotected exposure value 100. Then you divide this by the UV index, let's say it's 6 because it's a nice summer day. Then you divide 100 by 6 and that's 16 minutes. You can then spend a maximum of 16 minutes unprotected in the sun.
Regarding children, it is still nowhere described by the government how much sun they are allowed to get. A skin is mature from the age of 16, this has been scientifically researched. What the government does say is that children should have sunscreen on at all times and allowed to go out in the sun all day. That does not seem like a good advice to me. Personally, I recommend using half-doses. So to use the same example: Your child has skin type 2, for which the value is 100. An adult can then spend a maximum of 16 minutes unprotected in the sun, a child a maximum of 8 minutes.
Older people produce less Vitamin D. For them, on the contrary, it is SUPER important to be outdoors and in the sunlight a lot but they spend their time mostly indoors. The formula for them is the same formula, however, they make much less Vitamin D per minute.
Can you explain the MED value in an easy way?
MED stands for Minimum Erythema Dose, which is a value that indicates how much sun exposure (or how much UV radiation) the skin can handle without developing burning symptoms. This is hardly talked about because the government and the lords and ladies of dermatology state that this is too complicated, that people are not going to get it. I believe that people can understand this if you explain it well.
You are allowed to receive 100 MED per year on your skin. Suppose I can sit in the sun for 20 minutes without getting sunburnt but at 22 minutes my skin turns red, then those 20 minutes are 1 MED.
We used to be allowed to receive 200 MED per year. There used to be less skin cancer. Now there is a larger use of sunscreen, and there is more skin cancer. This raises questions.
What to do outside that unprotected time, apply sunscreen?
Mostly avoid and cover up, and if there really is no other way then apply sunscreen. I'm not against using sunscreen but it has to serve some purpose. Once you are working with the sun, a few things are super important. Always make sure you are sufficiently hydrated, eat enough fruits and vegetables, give rest to your skin and optimise your sleep. At night during your sleep, all sorts of repair processes take place for your system.
How is skin damage measured? How can you notice it? Is skin damage repairable?
The most obvious form of skin damage we've all experienced is sunburn. The skin is then red, swollen and can feel painful. If you go into the sun unprotected, you are much more aware of your sun behaviour. You can see that this group of people keeps a close eye on this. They know how long they can be in the sun and afterwards automatically seek shade or put on covering clothes. You don't protect yourself adequately with sunscreen, you need to get out of the sun, which protects better. Every day I receive stories from people who have been on holiday and didn't use sunscreen, they didn't burn and their skin didn’t peel! Skin peeling actually happens to almost every sunscreen user because they experience those peak loads. There are anti-inflammatories in sunscreen. So the skin can no longer show that it has been burnt. You see nothing on your skin, think you got a nice tan and go back into the sun the next day. At some point, the overexposed skin has no other choice than to get rid of itself (peeling) and rebuild itself. In fact, skin peeling only occurs from ignorance and holiday behaviour. I therefore always advise people to stay away from the upper limit of sun exposure. Only load yourself up to 70/80%, you don’t need more.
I came up with the hashtag #iksmeernietmeer (#nomoresunscreen) via my IG account. This is where the best stories and results are shared. That makes me very happy.
Are there any conditions that enhance or decrease sun power?
Natural conditions like reflection with for example sand, water and snow. These enhance sunlight. Clouds and shadows weaken sun power.
With correct sun behaviour, should you still fear skin cancer (peak exposure 95%)?
Sunlight can actually reduce other forms of cancer (40%). What types of cancer and at which percentage is this about, and are we talking about individual or collective level?
There have been several studies on the influence of sunlight and cancer. Ex dermatologist Han van der Rhee refers to this in his books, but also Dr. Gert Schuitemaker has opened my eyes. I have also been in contact with both of them several times to discuss my findings. Both are great advocates of taking on more vitamin D. Ex dermatologist Han van der Rhee of the Leiden University Medical Centre describes in one of his books his theory on proper unprotected behaviour, which is quite similar to the theory I describe. His book ZONNEN MAG (Tanning is allowed), a new vision on the sun and health is a highly recommended reading.
Breast cancer, cervical cancer, colon cancer and prostate cancer can be reduced by 40% with sufficient Vitamin D and thus sun exposure. These figures come from the KWF (Dutch Cancer Society). There are still a lot of gains to be made.
You once shared your findings with Pink Ribbon (breast cancer foundation). They did not want to publish your story, what about that?
That was painful because I had found something and wanted to share it with them. I used scientific studies showing that women with breast cancer actually benefit from optimal Vitamin D production by regularly and responsibly sunbathing. Breast cancer can be reduced by 40% collectively as a result. I handed them all the research. They indicated that this info was correct but did not want to publish it because the research was not 100% certain (which, by the way, is never the case regarding such types of research, I checked).
This foundation consists of members who pay to get the latest information. I was allowed to appear in the magazine with a sun product (without SPF) but not with my revelation. It seems to me that as a woman, you would want to know this info even if it is not 100% proven but 80% true! This shows that they are not completely free to write what they want. There is more to this.
You have been in this industry since 1993 so you have accumulated about 29 years of knowledge and experience. You have fully delved into the world of sun and sunscreen and have come across some pretty amazing things, to say the least. What did you find out?
I knocked on all government agencies' doors and spoke to various parties, dermatologists, the hospital, the doctors, KWF, GGD, RIVM, KNMI, the Dutch Health Council. Each and every one of them just play the same record: use sunscreen, use sunscreen, use sunscreen to prevent skin cancer according to the scientific studies. You have now gathered from my story that there are quite a few snags, some clouds in this advice.
So basically we have been and are being misinformed? In what way is this being done?
I can only advise to stay critical on what we are being told. Magazines are full of advertisements regarding sunscreens and one influencer after another comes along to promote a particular sunscreen product. I find it a pity that these people do not investigate but immediately take a message as the truth.
Finally, with all your knowledge, you have developed an app. What kind of app is this and why can't we use it yet?
The app has been developed so that you can track your own safe sun behaviour, so that we can prevent skin cancer and create as much Vitamin D as possible. All the data that matters to put together a safe sun formula for each individual is included in it. The app indicates your lower limit and upper limit. It tells you how long you can be out in the sun without burning. You can see how much Vitamin D you are making. It is all connected to your age, your skin type, the 4 colour phases within your skin type and you can apply it all worldwide. You can even fill in whether you have applied sunscreen or not. As tanning and tanning beds are a sensitive topic, I chose to record only factual information.
With this data, you can then hopefully look back in 10 years when someone has shown a certain sun behaviour and what the consequences have been. You can get a lot of information from that. The app is also applicable to tanning bed behaviour. You give people their own responsibility and freedom in their relationship with the sun back.
I offered my app to KWF Dutch Cancer Society for free, but I wanted to stay involved. The money to develop the app, I got it from my clients at the UV-health centre. My idea was, through the app, to give back to my clients and to the society, benefiting all of us. With the app, I still want to find out the truth behind the sun. The app has shown that we have been fooled for years, which is the eye-opener. For this reason, other parties are not open to using my app. I can't get it through. The narrative has to be kept consistent and intact, sunscreen is a billion-dollar business.
In 2010, your findings were acknowledged by the Dutch Health Council. How did that end?
In 2010, I had an appointment at the LUMC (Leiden University Medical Centre) to have the content of my app reviewed. That research leader went through my findings in detail and verified that my app contains the correct information and conclusions. I was so happy, I had managed to develop something to put the truth behind the sun and Vitamin D in the spotlight!
I was allowed to present my findings about my app at the KWF where the same research leader was present. During that talk, he kept quiet. I stood alone. That was hugely disappointing. I was back at square one.
Until now, I have not succeeded in getting my story or the app out in the world via the bigger parties. People don't want, don’t dare or are not allowed. After yet another closed door, I decided to do it alone. By focusing on IG, I found that people there are willing to listen and draw their own conclusions. We are growing quite fast, more and more people are finding us and asking for explanations and I can give them that. It hasn't gone the way I thought it would but this way the story still gets out and that's the most important thing.
By who or what are you being held back by at the moment? What can we (as readers) do to ensure that the app will still be realised?
We can become more and more critical and start confronting the right people/brands/foundations/government with the right questions and data. If we start doing that, then the day will come for the app to happen.
You organise a retreat in Spain for the first time this month (October 2022). Can you tell us something about that?
The location in Rocafort is a super beautiful quiet place near the Pyrenees. We become one with nature for a while. The location has sunshine all day and is private so people can fully expose themselves (if they want to) so they can experience what full sun exposure does to the body. We go into the mountains and go foraging with a Culinary Herbalist. She explains the value of the food that we will eat for our system. She also provides all the meals. Someone who knows everything about cell salts joins us as well; she will give 2 master classes. There is also an energy worker and Shiatsu specialist to give you treatments so that blockages can be released and energy can flow freely again. In 6 days, you are transported to this wonderful world of peace, beauty and introspection.
Is there anything else you would like to say?
At the moment, my message still feels a bit like shouting in the desert but fortunately my story is spreading more and more. I am keen to help and support people, including other parties who are open to this vision and want to know more about it. In the past year I had the opportunity to give 2 good interviews on the IG platform of @Cafeweltschmerz.nl; there you can find a lot of information about my vision. And of course on my own IG account. At the moment, I have calculated that between now and 4 years, there will probably be six million people who won't use sunscreen at all or way less. If this happens, my ultimate wish for a healthier approach to the sun will have come true. In the "Beauty industry", our view on the sun, health and beauty will enormously change in the following years. Something I am already looking forward to immensely.
If we want to dive deeper into the subject, where should we search?
I can totally recommend the books by Han van der Rhee and Dr. Gert Schuitemaker.
Where can people find you?
My IG account is @sunworldnl and our website sun-world.nl. You can already find a lot of information there, and people can of course make an online UV Coach appointment or just drop by our UV-health centre in Valkenswaard (Netherlands).