Mutlu, N., H. Esra, A. Begum, D. Fatma, Y. Arzu, H. Yalcin, K. Fatih, and K. Selahattin. “Relation of Maternal Vitamin D Status With Gestational Diabetes Mellitus and Perinatal Outcome”. African Health Sciences, vol. 15, no. 2, May 2015, pp. 523-31, doi:10.4314/ahs.v15i2.27.