1. Clinical Bacteriology Laboratory, Huddinge University Hospital
2. Department of Microbiology, Pathology, and Immunology, Division of Clinical Bacteriology, Karolinska Institutet, SE-14186, Stockholm
3. Department of Health and Environment, Division of Clinical Microbiology, Linköpings Universitet, SE-58185 Linköping
4. Department of Clinical Microbiology, Karolinska Hospital, SE-17176 Stockholm, Sweden