1. Second Department of Obstetrics and Gynecology, Hippokratio General Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. Department of Obstetrics and Gynecology, General Hospital of Xanthi, Xanthi, Greece
3. Department of Obstetrics and Gynecology, Democritus University of Thrace, Alexandroupolis, Greece