1. Department of Radiology, School of Medicine, National and Kapodistrian University of Athens, Aretaieion Hospital, 76 Vassilisis Sofias Ave, Athens 11528, Greece.
2. Department of Gynaecology and Obstetrics, REA Maternity Hospital, Athens, Greece.
3. Department of Health, Epidemiology and Medical Statistics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.