Department of Obstetrics and Gynaecology, University Hospital of Ioannina, Greece. Electronic address: orestis.tsonis@gmail.com. Department of Obstetrics and Gynaecology, University Hospitals of Birmingham, UK. Department of Obstetrics and Gynaecology, University Hospital of Athens, "Alexandra", Greece. 3rd Department of Obstetrics and Gynaecology, National and Kapodistrian University of Athens Medical School, Attikon Hospital, Athens, Greece. Department of Obstetrics and Gynaecology, University Hospital of Ioannina, Greece.