@Giraffe - for some reason I think that you'll enjoy it, I don't know exactly why but I guess that the presentation has some of your style..
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For the angels that are not willing to watch the whole thing, skip to 7:42.
And for those that were interested, open that Youtube channel, it has many relevant presentations related to vit D. For example, Michael Holick's Q&A session about sun and supplements (audio gets better).
Thank you very much. I always learn something new from your posts!