[1] Radboud Univ Nijmegen Med ctr, Dept Obstet & Gynaecol, NL-6500 HB Nijmegen, Netherlands
[2] Radboud Univ Nijmegen Med ctr, Dept Biostat & Epidemiol, NL-6500 HB Nijmegen, Netherlands
[3] Royal Hosp Women, Dept Gynaecol Oncol & Dysplasia, Carlton, Vic, Australia
[4] Free Mason Hosp, Dept Gynaecol, Melbourne, Vic, Australia