1. University Clinic of Obstetrics and Prenatal Medicine, Center of Fetal Surgery, University Medical Center Halle (Saale), Martin- Luther- University Halle-Wittenberg , Halle , Germany
2. Institute of Anatomy, Leipzig-University , Leipzig , Germany
3. Institute of Medical Epidemiology, Biostatistics, and Informatics , Martin-Luther-University Halle-Wittenberg , Halle (Saale) , Germany
4. Clinic and Polyclinic for Obstetrics and Women’s Diseases, University Medicine Mainz , Mainz , Germany
5. Medical Center of Prenatal Diagnosis and Human Genetic , Berlin , Germany