1. Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
2. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Department of Infectious Diseases – Ullevål, Oslo University Hospital, Oslo, Norway
4. Department of Radiology, Oslo University Hospital, Oslo, Norway
5. Regional Advisory Unit for Imported and Tropical Diseases, Dept. of Infectious Diseases – Ullevål, Oslo University Hospital, Oslo, Norway