Kumari, A., S. Mitra, H. C. Tiwari, and R. Srivastav. “Hypovitaminosis D in Pregnancy and Its Correlation With Preeclampsia and Gestational Diabetes Mellitus”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 6, no. 3, Feb. 2017, pp. 890-6, doi:10.18203/2320-1770.ijrcog20170551.