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Low wintertime vitamin D levels in a sample of healthy young adults of diverse ancestry living in the Toronto area: associations with vitamin D intake and skin pigmentation

Agnes Gozdzik, Jodi Lynn Barta, Hongyu Wu, Dennis Wagner, David E Cole, Reinhold Vieth, Susan Whiting and Esteban J Parra*

BMC Public Health 2008, 8:336  doi:10.1186/1471-2458-8-336