1. Department of Internal Medicine, Landspitali–The National University Hospital of Iceland , Reykjavik , Iceland
2. Department of Gastroenterology and Hepatology, Landspitali–The National University Hospital of Iceland , Reykjavik , Iceland
3. Faculty of Medicine, School of Health Sciences, University of Iceland , Reykjavik , Iceland
4. Department of Science, Landspitali–The National University Hospital of Iceland , Reykjavik , Iceland
5. Vogur Hospital, SAA–National Center of Addiction Medicine , Reykjavik , Iceland
6. Department of Clinical Microbiology, Landspitali–The National University Hospital of Iceland , Reykjavik , Iceland
7. Center for Health Security and Communicable Disease Control, Directorate of Health , Reykjavik , Iceland
8. Department of Infectious Diseases, Landspitali–The National University Hospital of Iceland , Reykjavik , Iceland