P. Sathish, S. Raveendran, R. Padma, D. Balakrishnan, and M. Muthusami, “Association between placental vitamin D receptor expression and cord blood vitamin D level and its effect on the birth weight of newborns”, Int J Reprod Contracept Obstet Gynecol, vol. 5, no. 9, pp. 2904–2908, Feb. 2017.