1. Department of Infectious Diseases; Karolinska University Hospital Huddinge; Stockholm Sweden
2. Division of Infectious Diseases; Department of Medicine; Karolinska Institutet; Stockholm Sweden
3. Division of Clinical Microbiology; Department of Laboratory Medicine; Karolinska Institutet; Stockholm Sweden
4. Institute of Experimental Virology; Twincore Centre for Experimental and Clinical Infection Research; Hannover Germany
5. Department of Infectious Diseases; Akademiska University Hospital; Uppsala Sweden
6. Department of Gastroenterology and Hepatology; Karolinska University Hospital Solna and Huddinge; Stockholm Sweden
7. Department of Infectious Diseases; University Hospital; Linköping Sweden
8. Department of Infectious Diseases; Sahlgrenska University Hospital; Gothenburg Sweden
9. Clinical Pathology and Cytology; Department of Medicine; Karolinska University Hospital Huddinge; Stockholm Sweden