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We found the article by Dijkstra et al1 very interesting. We recently conducted a study in 93 non-pregnant women, aged 20–50 years, to determine the prevalence of vitamin D deficiency in women at risk of vitamin D deficiency because of wearing concealing clothes (such as a veil). This prospective study was performed between December 2004 and January 2005 in a general practitioner setting in Lyon, France. We found that almost 99% of these young women had mild …
Competing interests: None.