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