1. Morbid Obesity Centre; Vestfold Hospital Trust; Tønsberg Norway
2. Department of Clinical Science; University of Bergen; Bergen Norway
3. Environment and Health; Department of Public Health and Primary Care; KU Leuven - University of Leuven; Leuven Belgium
4. Faculty of Medicine; University of Oslo; Oslo Norway
5. Department of Clinical Psychology; University of Bergen; Bergen Norway
6. Department of Endocrinology, Morbid Obesity and Preventive Medicine; Institute of Clinical Medicine; University of Oslo; Oslo Norway