Agrawal M, Aggarwal N, Sikka P, Chopra S, Suri V, Rana S S, Raveendran A
Department of Obstetrics and Gynaecology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.
J Obstet Gynaecol. 2013 Jul;33(5):536-7. doi: 10.3109/01443615.2013.790883.