Tyagi, V., Tyagi, M., Gupta, S., Khanuja, E. and Varma, Y. (2020) “Maternal vitamin D levels in hypertensive disorders of pregnancy”, International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 9(12), pp. 4870–4873. doi: 10.18203/2320-1770.ijrcog20204936.