1. Unit of Infectious Diseases and Dermatology; Department of Medicine Huddinge; Karolinska Institutet; Stockholm Sweden
2. Centre for Clinical Research; County Hospital Västerås; Västerås Sweden
3. CLINTEC; Department of Obstetrics and Gynaecology; Karolinska University Hospital Huddinge; Stockholm Sweden
4. Division of Clinical Microbiology; Department of Laboratory Medicine; Karolinska Institutet; Stockholm Sweden
5. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden