1. Faculty of Medicine, Cairo University; Department of Obstetrics & Gynaecology; Cairo Egypt
2. Academic Medical Center, University of Amsterdam; Center for Reproductive Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
3. Academic Medical Center; Department of Obstetrics and Gynaecology, Center for Reproductive Medicine; Amsterdam Netherlands
4. UKSH, Campus Lűbeck; Ratzeburger Allee 160 Lűbeck Germany 23552
5. Beni-Suef University; Department of Obstetrics & Gynaecology; Beni Suef Egypt
6. Egyptian International Fertility IVF Center (EIFC-lVF), Cairo University; Department of Obstetrics and Gynaecology; 40 Abd El Reheem Sabry St, Eldokki Mohandeseen Cairo Egypt