1. Department of Research and Development; Division of Emergencies and Critical Care; Oslo University Hospital; Oslo Norway
2. Department of Infectious Diseases; Akershus University Hospital; Institute of Clinical Medicine; University of Oslo; Oslo Norway
3. Department of Gastroenterology; Oslo University Hospital; Institute of Clinical Medicine; University of Oslo; Oslo Norway
4. Department of Gastroenterology; Skånes University Hospital; Malmö Sweden
5. Department of Public Health; Faculty of Nursing Science; Oslo and Akershus University College of Applied Sciences; Oslo Norway
6. Department of Nursing Science; Institute of Health and Society; Faculty of Medicine; University of Oslo; Oslo Norway