1. Center for Fetal Medicine, Pregnancy and Ultrasound University Hospital Rigshospitalet Copenhagen Denmark
2. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
3. Chromosome Genetics Laboratory CHU Montpellier University of Montpellier Montpellier France
4. Centre for Trials Research Cardiff University Cardiff UK
5. Sahlgrenska University Hospital Gothenburg Sweden
6. Department of Obstetrics and Gynecology Columbia University New York NY USA
7. Department of Human Genetics KU Leuven Leuven Belgium
8. Department of Clinical Genetics Aarhus University/Aarhus University Hospital Aarhus Denmark
9. Center for Fetal Diagnostics Aarhus University/Aarhus University Hospital Aarhus Denmark