[1] Hannover Med Sch, Dept Gynecol, Hannover, Germany
[2] Univ Med Ctr Hamburg Eppendorf, Dept Gynecol, Hamburg, Germany
[3] Dept Gynecol, UKSH Campus Lubeck, Lubeck, Germany
[4] Carl Gustav Carus Univ Dresden, Dept Gynecol & Obstet, TU Dresden, Dresden, Germany
[5] Duesseldorf Univ Hosp, Dept Gynecol, Dusseldorf, Germany
[6] Univ Tubingen, Dept Gynecol & Obstet, Tubingen, Germany
[7] Klinikum Wolfsburg, Dept Obstet & Gynecol, Wolfsburg, Germany
[8] Georg August Univ, Dept Gynecol & Obstet, Gottingen, Germany
[9] Sana Klinikum Offenbach, Dept Gynaecol, Offenbach, Germany
[10] Alb Fils Kliniken, Klin Eichert, Dept Gynecol, Goppingen, Germany
[11] Hosp Altoettingen, Dept Gynecol, Altoettignen, Germany
[12] Univ Hosp Cologne, Dept Gynecol, Cologne, Germany
[13] Oberhavel Hosp, Oranienburg, Germany
[14] Gynecol Oncol Ctr, Kiel, Germany
[15] Ludwig Maximilians Univ Munchen, Univ Hosp, Dept Obstet & Gynecol, Munich, Germany
[16] Jerusalem Hosp, Hamburg, Germany
[17] Univ Ulm, Dept Gynecol, Ulm, Germany