1. Second Department of Obstetrics and Gynecology, School of Medicine, Aristotle University of Thessaloniki, 56403 Thessaloniki, Greece
2. Endocrine Unit of Aretaieion Hospital, Medical School, National and Kapodistrian University of Athens, 11528 Athens, Greece
3. Midwifery Department, School of Health Sciences, International Hellenic University, 65404 Thessaloniki, Greece