1. OB&GYN, Division of Prenatal Medicine, Justus-Liebig-University, Gießen
2. German Center for Fetal Surgery & Minimally Invasive Therapy (DZFT), Justus-Liebig-University, Giessen
3. OB&GYN, Division of Prenatal Medicine, Caritas Krankenhaus St. Josef, University of Regensburg
4. OB&GYN, Division of Prenatal Medicine, University of Schleswig-Holstein, Campus Luebeck
5. Center for Endocrinology, Fertility and Prenatal Medicine, amedes Hamburg
6. OB&GYN, Division of Prenatal Medicine, University Hospital, Bonn