1. Department of Maternal and Child Health and Urological Sciences Sapienza University of Rome Rome Italy
2. Department of Obstetrics and Gynecology, Fondazione Policlinico Tor Vergata University of Rome Tor Vergata Rome Italy
3. Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust, University of London London UK
4. Vascular Biology Research Centre Molecular and Clinical Sciences Research Institute, St George's University of London London UK
5. Fetal Medicine Unit Liverpool Women's Hospital, University of Liverpool Liverpool UK
6. Department of Woman's and Child's Health University of Padova Padova Italy