1. National Center for Fetal MedicineTrondheim University Hospital (St Olavs Hospital) Trondheim Norway
2. Department of Clinical and Molecular MedicineNorwegian University of Science and Technology Trondheim Norway
3. Centre for Fetal CareQueen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust London UK
4. Parma University Hospital Parma Italy
5. St Orsola Malpighi University Hospital Bologna Italy
6. Department of Obstetrics and GynecologyStavanger University Hospital Stavanger Norway
7. Department of Obstetrics and Gynecology, Clinical SciencesLund University Lund Sweden
8. Department of Obstetrics and GynecologyLandspitali University Hospital Reykjavik Iceland
9. Hvidovre University Hospital Copenhagen Denmark