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1.
2012
Ganji, V.,  Zhang, X.,  Tangpricha, V. Serum 25-hydroxyvitamin D concentrations and prevalence estimates of hypovitaminosis D in the U.S. population based on assay-adjusted data. Journal of Nutrition. 142, (3), 498-507.
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2.
2010
Zhang, X.,  Saaddine, J.B.,  Chou, C.F.,  Cotch, M.F.,  Cheng, Y.J.,  Geiss, L.S.,  Gregg, E.W.,  Albright, A.L.,  Klein, B.E.,  Klein, R. Prevalence of diabetic retinopathy in the United States, 2005-2008. JAMA, The Journal of the American Medical Association. 304, (6), 649-656.
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