1 Department of General Surgery and Medical Surgical Specialties, Gynecology and Obstetrics Section, University of Catania, Via Santa Sofia 78, 95125 Catania, Italy.
2 Centre for Reproductive Medicine, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium.
3 Department of Obstetrics and Gynecology, University Hospitals of Geneva, Geneva, Switzerland.
4 Department of Obstetrics and Gynaecology, Alexandria University, Alexandria, Egypt.