1. Section of Nutrition and Dietetics Division of Medicine Department of Clinical Service Oslo University Hospital Oslo Norway
2. Institute of Clinical Medicine University of Oslo Oslo Norway
3. Department of Endocrinology, Morbid Obesity and Preventive Medicine Oslo University Hospital Oslo Norway
4. Department of Chronic Diseases and Ageing Norwegian Institute of Public Health Oslo Norway
5. Department of Transplantation Medicine Oslo University Hospital Oslo Norway
6. Department of Biomedical Sciences and NNF Centre for Basic Metabolic Research Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
7. Oslo Centre for Biostatistics and Epidemiology Faculty of Medicine University of Oslo Oslo Norway