[1] Vrije Univ Amsterdam, Med Ctr Amsterdam, Gynecol, Amsterdam, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Gynecol, Nijmegen, Netherlands
[3] Isala, Gynecol, Zwolle, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, Epidemiol & Biostat, Amsterdam, Netherlands
[5] Vrije Univ Amsterdam, Med Ctr, Gynecol, Amsterdam, Netherlands
[6] Univ Hosp Leuven, Gynecol, Leuven, Belgium