1. Endometriosis Research Center, Iran University of Medical Science, Tehran, Iran
2. Pain Research Center, Iran University of Medical Science, Tehran, Iran
3. Department of Anesthesiology, Zabol University of Medical Science, Zabol, Iran
4. Department of Gynecology and Obstetrics, Zabol University of Medical Science, Zabol, Iran
5. Faculty of Public Health, Department of Biostatistics and Epidemiology, Kerman University of Medical Science, Kerman, Iran
6. Resident of Obstetrics and Gynecology, Iran University of Medical Sciences, Tehran, Iran
7. Resident of Anesthesiology, Iran University of Medical Sciences, Tehran, Iran