1. Department of Obstetrics and Prenatal Medicine Asklepios Clinic Barmbek, Asklepios Medical School Hamburg Germany
2. Center for Fetal Therapy, Department of Gynecology & Obstetrics Johns Hopkins University Baltimore Maryland USA
3. Department of Obstetrics and Gynecology University Hospital of Schleswig‐Holstein Kiel Germany
4. Department of Obstetrics and Gynecology Marienhaus Klinikum St. Elisabeth Neuwied Germany
5. Department of Obstetrics Charité Universitätsmedizin Berlin Berlin Germany
6. Department of Obstetrics and Prenatal Medicine University of Jena Jena Germany
7. Department of Medical Informatics, Biometry and Epidemiology Ruhr‐University Bochum Bochum Germany