Institution: | 1. Fetal Medicine Unit, 3rd Department of Obstetrics and Gynaecology, Athens Medical School, National and Kapodistrian University of Athens, 'Attikon' University Hospital, Athens, Greece;2. Department of Obstetrics and Gynaecology, Royal Free Hospital, London, UK;3. 2nd Department of Obstetrics and Gynecology, University of Athens Medical School, Aretaieio Hospital, Athens, Greece |