Chandel, A. B., R. Mittal, A. Sharma, S. Mittal, and P. Samyal. “Prevalence of Vitamin D Deficiency in Antenatal Women”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 6, May 2019, pp. 2302-5, doi:10.18203/2320-1770.ijrcog20192421.