1. Department of Obstetrics and Gynaecology; SS. Annunziata Hospital, G. D'Annunzio University of Chieti-Pescara; Chieti Italy
2. St George's; University of London & St George's University Hospitals NHS Foundation Trust Molecular and Clinical Sciences Research Institute; London UK
3. Department of Obstetrics and Gynaecology; Università di Roma Tor Vergata; Rome Italy
4. Department of Obstetrics and Gynaecology; Catholic University of the Sacred Heart; Rome Italy
5. Department of Clinical Medicine, Faculty of Health Sciences; UiT - The Arctic University of Norway; Tromsø Norway
6. Department of Obstetrics and Gynaecology; University Hospital of Northern Norway; Tromsø Norway