1. Department of Microbiology and Infection Control, University Hospital of North Norway, Tromsö, Norway
2. Department of Obstetrics and Gynaecology, Vestfold Central Hospital, Tönsberg, Norway
3. Department of Surgery, University Hospital of North Norway, Tromsö, Norway
4. Culture Collection, Department of Clinical Bacteriology, University of Göteborg, Göteborg, Sweden
5. Institute of Medical Microbiology, National Hospital, University of Oslo, Oslo, Norway