[1] Med Univ Vienna, Dept Gen Gynecol & Gynecol Oncol, Wahringer Gurtel 18-20, A-1090 Vienna, Austria
[2] Karl Landsteiner Inst, Dept Special Gynecol & Obstet, Vienna, Austria
[3] Med Univ Vienna, Dept Anesthesiol, Vienna, Austria
[4] Outcomes Res Consortium, Cleveland, OH USA
[5] Med Univ Vienna, Dept Obstet & Fetomaternal Med, Vienna, Austria
[6] Gen Hosp Rudolfstiftung, Dept Gynecol & Obstet, Vienna, Austria