[Vitamin D deficiency also frequent among the young].
D003430:Cross-Sectional Studies; D003718:Denmark; D006801:Humans; D012016:Reference Values; D012307:Risk Factors; D012737:Sex Factors; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D014808:Vitamin D Deficiency / Q000097:blood / Q000175:diagnosis* / Q000453:epidemiology*
D014807:Vitamin D; C104450:25-hydroxyvitamin D