1. Department of Clinical Genetics Aarhus University Hospital Aarhus N Denmark
2. Center for Fetal Diagnostics, Department of Clinical Medicine Aarhus University Aarhus N Denmark
3. Royal Prince Alfred Hospital, Women and Babies Sydney Institute for Women, Children and their Families Sydney New South Wales Australia
4. Center of Fetal Medicine and Pregnancy, Department of Obstetrics Copenhagen University Hospital København Ø Denmark
5. Department of Clinical Medicine University of Copenhagen København N Denmark