Latika Chawla1, Shashi Prateek2, Anupama Bahadur2, Prashant Durgapal3. 1. Department of Obstetrics and Gynecology, All India Institute of Medical Sciences, Rishikesh, 249203, India. Electronic address: latika.c@rediffmail.com. 2. Department of Obstetrics and Gynecology, All India Institute of Medical Sciences, Rishikesh, 249203, India. 3. Department of Pathology, All India Institute of Medical Sciences, Rishikesh, India.