1. Department of Obstetrics and Gynecology, Akbarabadi Teaching Hospital, Iran University of Medical Sciences, Tehran, Iran
2. Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran
3. Department of Obstetrics and Gynecology, Firoozgar Teaching Hospital, Iran University of Medical Sciences, Tehran, Iran
4. Department of Anesthesiology, Firoozgar Teaching Hospital, Iran University of Medical Sciences, Tehran, Iran
5. Faculty of Medicine, University of Exeter, Exeter, UK