Irene M van der Meer, Nasra S Karamali, A Joan P Boeke, Paul Lips, Barend JC Middelkoop, Irene Verhoeven, Jan D Wuister,
High prevalence of vitamin D deficiency in pregnant non-Western women in The Hague, Netherlands The American Journal of Clinical Nutrition. ,vol. 84, pp. 350- 353 ,(2006) ,
10.1093/AJCN/84.1.350