1. Department of Endocrinology, Morbid Obesity, and Preventive Medicine, Oslo University Hospital, Oslo, Norway.
2. Faculty of Medicine, The University of Oslo, Oslo, Norway.
3. Islet Biology Exeter, Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, Exeter, United Kingdom.
4. Department of Breast and Endocrine Surgery, Oslo University Hospital, Oslo, Norway.
5. Department of Pediatric Medicine, Oslo University Hospital, Oslo, Norway.