Yadav, O., and Y. Syed. “A Study on Prevalence of Vitamin D Deficiency Among Pregnant Women Attending a Tertiary Health Centre in Rajasthan, India”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 12, no. 7, June 2023, pp. 2218-22, doi:10.18203/2320-1770.ijrcog20231937.