1. Division of Prenatal Medicine, Department of Obstetrics and Gynecology, Justus-Liebig University and University Hospital UKGM Giessen, 35392 Giessen, Germany
2. Pediatric Heart Centre, 04050 Kiew, Ukraine
3. Division of Prenatal Medicine, Department of Obstetrics and Gynecology, University Hospital of Schleswig-Holstein, Campus Lübeck, 23538 Lübeck, Germany
4. Prenatal Medicine, Prenatal Care Center Stuttgart, 70184 Stuttgart, Germany