Affiliation: | 1. Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo 2. University Hospital, Oslo, Norway;3. Institute of Clinical Medicine, University of Oslo, Oslo, Norway;4. Department of Health Management and Health Economics, University of Oslo, Oslo, Norway;5. Department of Gastrointestinal Surgery, Oslo 6. Department of Gastroenterology, Akershus University Hospital, L?renskog, Norway |