1. OB&GYN, Division of Prenatal Medicine, University Gießen and Marburg
2. OB&GYN, Division of Prenatal Medicine, Caritas Krankenhaus St. Josef, University of Regensburg
3. OB&GYN, Division of Prenatal Medicine, University of Bonn
4. Zentrum für Endokrinologie, Kinderwunsch und Pränatale Medizin, amedes Hamburg
5. OB&GYN, Division of Prenatal Medicine, University of Schleswig-Holstein, Campus Lübeck