Julie Christy A, Saraswathi Perumal, and Sumathy G. “25 Hydroxycholicalciferol Levels During Pregnancy in Rural and Urban Population of South India”. International Journal of Research in Pharmaceutical Sciences 12, no. 2 (June 9, 2021): 1590-1596. Accessed November 27, 2021. https://pharmascope.org/index.php/ijrps/article/view/4744.