[1] Tech Univ Munich, Klinikum Rechts Isar, Frauenklin, Munich, Germany
[2] Tech Univ Munich, Klinikum Rechts Isar, Frauenklin & Poliklin, Munich, Germany
[3] Tech Univ Munich, Inst Med Informat Stat & Epidemiol, Munich, Germany
[4] Frauenklin & Poliklin, Lehrstuhl Gynakol & Geburtshilfe, Munich, Germany
[5] Tech Univ Munich, Frauenklin Rechts Isar, Munich, Germany