“…Maternal vitamin D deficiency occurs worldwide, even in sunny climates, and is a significant public health issue with prevalence rates ranging from 5 to 89% depending on the cutoff value used (Bodnar et al, 2007b;Greer, 2008;Prentice, 2008;Sahu et al, 2009;Yu et al, 2009;Hamilton et al, 2010;Agarwal and Arya, 2011;Hossain et al, 2011;Johnson et al, 2011;Vandevijvere et al, 2012;McAree et al, 2013;Andersen et al, in press). In a recent study in the US, an estimated 5 to 29% of pregnant women had inadequate vitamin D status with a higher prevalence in African Americans who are at a higher risk of vitamin D deficiency due to increased skin pigmentation which can decrease endogenous vitamin D production (Brannon and Picciano, 2011).…”