1. Department of Infectious Diseases, Hospital of Västmanland, Västerås, Sweden;
2. Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden;
3. Centre for Clinical Research Västmanland, Uppsala University, Hospital of Västmanland, Västerås, Sweden;
4. Department of Clinical Microbiology, Hospital of Västmanland, Västerås, Sweden