1. Department of Obstetrics and Gynecology; Stavanger University Hospital; Stavanger Norway
2. National Center for Fetal Medicine; Trondheim University Hospital (St Olavs Hospital); Trondheim Norway
3. Fetal Medicine Department, Rosie Maternity Hospital; Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust; Cambridge UK
4. Department of Obstetrics and Gynaecology, Clinical Sciences; Lund University; Lund Sweden
5. Centre for Fetal Care; Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust; London UK