1. Division of Prenatal Medicine, Department of OB/GYN, Justus-Liebig-University, Giessen
2. Pediatric Heart Center, Justus-Liebig-University, Giessen
3. German Center for Fetal Surgery & Minimally Invasive Therapy (DZFT), Justus-Liebig-University, Giessen
4. Division of Prenatal Medicine, University Hospital of Schleswig-Holstein, Campus Luebeck, Luebeck
5. Department of Obstetrics and Prenatal Medicine, University Bonn Medical School, Bonn
6. Center for Prenatal Medicine, Caritas Hospital St. Josef, Regensburg
7. Center for Endocrinology, Reproductive and Prenatal Medicine, amedes, Hamburg