Subrata Das1, Jyotirmoy Hajra2, Joydeb Roychowdhury2. 1. Department of Obstetrics & Gynecology, ESI Postgraduate Institute of Medical Sciences and Research & ESIC Hospital, Diamond Harbour Road, Joka, Kolkata, 700104 India ; J/6, Banerjee para, Kamdahari, Garia, Kolkata, 700084, West Bengal India. 2. Department of Obstetrics & Gynecology, ESI Postgraduate Institute of Medical Sciences and Research & ESIC Hospital, Diamond Harbour Road, Joka, Kolkata, 700104 India.