1. 2nd Department of Obstetrics and Gynecology, University of Athens Medical School, Aretaieio Hospital, 11526 Athens, Greece
2. Obstetric and Gynecological Unit and Research Center, Evgenideio Hospital, University of Athens, 11526 Athens, Greece
3. Department of Obstetrics and Gynaecology, University Hospital of Heraklion, 71110 Heraklion, Crete, Greece