1. Division of Prenatal Medicine and Gynecologic Sonography, Department of Gynecology and Obstetrics; University of Köln; Köln Germany
2. praenatal.de, Prenatal Medicine and Genetics; Köln Germany
3. Congenital Cardiac Center (‘Deutsches Kinderherzzentrum’); Sankt Augustin Germany
4. Department of Pediatric Cardiology; University of Bonn; Bonn Germany
5. Department of Obstetrics and Prenatal Medicine; University of Bonn; Bonn Germany