1. The Centre for Health Research, District General Hospital of Førde, Førde, Norway
2. Department of Health and Caring Sciences, Western Norway University of Applied Sciences, Førde, Norway
3. Department of Psychiatry, District General Hospital of Førde, Førde, Norway
4. Department of Psychology, University of Surrey, Guildford, England
5. Centre for Obesity Research, Clinic of Surgery, St. Olavs University Hospital, Trondheim, Norway
6. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway