1. Department of Obstetrics and Gynecology, University Hospital Schleswig Holstein, Luebeck, Germany
2. Department of Obstetrics and Gynecology, University Hospital Schleswig Holstein, Campus Kiel, Kiel, Germany
3. Endometriosis Research Center, Iran University of Medical Sciences (IUMS), Tehran, Iran
4. Department of Obstetrics and Gynecology, Leverkusen Municipal Hospital, Leverkusen, Germany
5. First Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, Thessaloniki, Greece