[1] Karolinska Univ Hosp, Karolinska Inst, Dept Obstet & Gynecol, S-14186 Huddinge, Stockholm, Sweden
[2] Daneryds Univ Hosp, Karolinska Inst, Dept Obstet & Gynecol, Stockholm, Sweden
[3] Sahlgrens Univ Hosp, Dept Gynecol, Gothenburg, Sweden
[4] Sahlgrens Univ Hosp, Dept Pathol, Gothenburg, Sweden
[5] Sahlgrens Univ Hosp, Onkol Centrum, Gothenburg, Sweden
[6] Uppsala Univ, Akad Sjukhuset, Dept Dermatovenereol, Uppsala, Sweden
[7] MAS Univ Hosp, Dept Obstet & Gynecol, Malmo, Sweden
[8] Umea Univ Hosp, Dept Obstet & Gynecol, S-90185 Umea, Sweden
[9] Lund Univ, Malmo Univ Hosp, Dept Med Microbiol, Malmo, Sweden