Santhana Lakshmi, C., Nagesh Kumar, A. and Ramchandra Valvekar, U. (2017) “Serum 25- hydroxy vitamin D levels in pregnant women with increase in parity in Tamilnadu population”, Obs Gyne Review: Journal of Obstetric and Gynecology, 3(4), pp. 51-56. doi: 10.17511/joog.2017.i04.04.