1. Department of Clinical Service, Section of Nutrition and Dietetics, Division of Medicine, Oslo University Hospital, Oslo, Norway
2. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
3. Unger-Vetlesens Institute, Lovisenberg Diaconal Hospital, Oslo, Norway
4. Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway
5. Department of Gastroenterology, Oslo University Hospital, Oslo, Norway
6. Department of Public Health, Oslo Metropolitan University, Oslo, Norway
7. Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
8. Department of Health Sciences, Østfold University College, Fredrikstad, Norway
9. Department of Medicine, Diakonhjemmet Hospital, Oslo, Norway
10. Medical department, Vestfold Hospital Trust, Tønsberg, Norway
11. Medical department, Innlandet Hospital Trust, Hamar, Norway
12. Department of Medicine, Innlandet Hospital Trust, Gjøvik, Norway
13. Department of Gastroenterology, Telemark Hospital, Skien, Norway
14. Department of Medicine, Lovisenberg Diaconal Hospital, Oslo, Norway
15. Department of Medicine, Bærum Hospital, Vestre Viken Hospital Trust, Gjettum, Norway
16. Department of Health and Care Sciences, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromso, Norway
17. Department of Nutrition, Faculty of Medicine, UiT The Arctic University of Norway, Tromso, Norway
18. Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway