Affiliation: | a Department of Obstetrics and Gynecology, Central Hospital, Karlstad, Sweden b Department of Pathology, Central Hospital, Karlstad, Sweden c Department of Obstetrics and Gynecology, University Hospital, Örebro, Sweden d Department of Medical Microbiology, Lund University, University Hospital at Malmö, Malmö, Sweden e Department of Obstetrics and Gynecology, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden f Department of Pathology, Norwegian National Hospital, University of Oslo, Oslo, Norway. |