Karpa, Monica, et al. “To Compare Serum Vitamin D Status in Pre-Eclamptic and Non-Preeclamptic Pregnant Women in Labour: A Tertiary Care Centre Study of Northern India”. Clinical Journal of Obstetrics and Gynecology, vol. 5, no. 1, Jan. 2022, pp. 013-8, doi:10.29328/journal.cjog.1001100.