1. Department of Obstetrics and Gynecology, General Hospital of Athens ‘Alexandra’, National and Kapodistrian University of Athens, Lourou and Vasilissis Sofias Ave, 11528 Athens, Greece
2. Department of Internal Medicine, General Hospital of Larisa, Tsakalof 1, 41221 Larisa, Greece
3. Department of Obstetrics and Gynecology, Democritus University of Thrace, 6th km Alexandroupolis-Makris, 68100 Alexandroupolis, Greece