1. Department of Obstetrics and Gynaecology, University Hospital of Heraklion, Heraklion, Greece;
2. Theageneion Anticancer Hospital, Thessaloniki, Greece;
3. First Department of Obstetrics and Gynaecology, “Alexandra” Maternity Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece;
4. Department of Obstetrics and Gynaecology, Agios Nikolaos General Hospital, Agios Nikolaos, Crete, Greece;
5. Third Department of Obstetrics and Gynaecology, “Attikon” Hospital, National and Kapodistrian University of Athens, Athens, Greece