[1] Univ Hosp, Dept Obstet Gynecol, Cologne, Germany
[2] Univ Hosp Maastricht, Dept Obstet Gynecol, Maastricht, Netherlands
[3] Catharina Hosp, Dept Obstet Gynecol, Eindhoven, Netherlands
[4] Marienhaus Klinikum, Dept Obstet Gynecol, Neuwied, Germany
[5] Univ Hosp Wurzburg, Dept Pediat & Neonatol, Wurzburg, Germany