1. Department of Obstetrics and Gynecology, Democritus University of Thrace, 68100 Alexandroupolis, Greece
2. Department of Obstetrics and Gynecology Medical School, University Hospital Alexandra, National and Kapodistrian University of Athens, 12462 Athens, Greece
3. Department of Midwifery, School of Health Sciences, University of West Attica (UNIWA), 12243 Athens, Greece
4. Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens and Rea Maternity Hospital, 12462 Athens, Greece