[1] Radboud Univ Nijmegen, Med Ctr, Dept Obstet & Gynecol 791, NL-6500 HB Nijmegen, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Epidemiol, NL-6500 HB Nijmegen, Netherlands
[3] Radboud Univ Nijmegen, Med Ctr, Dept Radiol, NL-6500 HB Nijmegen, Netherlands