1. National Center for Fetal Medicine; Trondheim University Hospital (St Olavs Hospital); Trondheim Norway
2. Institute of Clinical and Molecular Medicine; Norwegian University of Science and Technology; Trondheim Norway
3. Center for Fetal Care; Queen 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 Gynecology; Stavanger University Hospital; Stavanger Norway
7. Department of Obstetrics and Gynecology; Clinical Sciences; Lund University; Lund Sweden
8. Hvidovre University Hospital; Copenhagen Denmark