1. Department of Obstetrics and Gynecology, Medical School, University of Ioannina, Ioannina, Greece
2. Department of Bloodbank, University Hospital of Ioannina, Ioannina, Greece
3. Endocrinology Unit, 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens Medical School, Aretaieio Hospital, Athens, Greece
4. 3rd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens Medical School, Attikon Hospital, Athens, Greece