1. 2nd Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki School of Medicine, Thessaloniki, Greece
2. Athens, Greece
3. 2nd Department of Obstetrics and Gynecology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
4. Department of Obstetrics and Gynecology, University of Ioannina Medical School, Ioannina, Greece