1. Department of Obstetrics and Gynaecology, Vardhman Mahavir Medical College, Guru Gobind Singh Indraprastha University, New Delhi, India;
2. Department of Obstetrics and Gynaecology, Vardhman Mahavir Medical College, Safdarjung Hospital, New Delhi, India;
3. Department of Radiation Oncology, Rajiv Gandhi Cancer Institute and Research Centre, New Delhi, India