Birgit Arabin1, Janina Goerges2, Caterina M Bilardo3. 1. Center for Mother and Child Philipps University Marburg, Marburg, Germany; Clara Angela Foundation Witten and Berlin, Alfred Herrhausen Strasse 44, 58455 Witten, Germany. Electronic address: bine.clara.angela@gmail.com. 2. Center for Mother and Child Philipps University Marburg, Marburg, Germany; Clara Angela Foundation, Witten and Berlin, Germany. 3. Department of Obstetrics and Gynecology, Fetal Medicine Unit, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands; Clara Angela Foundation, Witten and Berlin, Germany.