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Orton, S., A. Morris, B. Herrera, S. Ramagopalan, MR Lincoln, M. Chao, R. Vieth, A. Sadovnick, and G. Ebers. Evidence for Genetic Regulation of Vitamin D Status in Twins with Multiple Sclerosis. 2008.

Orton, S., et al. Evidence for Genetic Regulation of Vitamin D Status in Twins with Multiple Sclerosis. 2008.