1. Centre for Nutrition, Department of Clinical Medicine University of Bergen Bergen Norway
2. National Centre for Functional Gastrointestinal Disorders, Department of Medicine Haukeland University Hospital Bergen Norway
3. Mohn Medical Imaging and Visualization Centre Haukeland University Hospital Bergen Norway
4. Department of Biomedicine University of Bergen Bergen Norway
5. Department of Biological and Medical Psychology University of Bergen Bergen Norway
6. Unger‐Vetlesen Institute Lovisenberg Diaconal Hospital Oslo Oslo Norway
7. Institute of Clinical Medicine University of Oslo Oslo Norway