1. Assisted Reproduction Unit, 3rd Department of Obstetrics and Gynaecology, Medical School, National and Kapodistrian University of Athens, Chaidari, Athens, Greece,
2. Department of Obstetrics and Gynaecology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece, and
3. 3rd Department of Obstetrics and Gynaecology, Medical School, National and Kapodistrian University of Athens, Chaidari, Athens, Greece