B. P. Thangappah, R., Sampson, U., Azad, A., Arumugam, R., Anand, S. and Karunakaran, P. (2019) “A study to evaluate serum 25-hydroxy vitamin D3 and calcium levels in maternal and cord blood and their effect on pregnancy outcome”, International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 8(4), pp. 1575–1582. doi: 10.18203/2320-1770.ijrcog20191221.