1. Endocrine Medicine Group, Department of Clinical Science, University of Bergen , Bergen , Norway
2. Department of Medicine, Haukeland University Hospital , Bergen , Norway
3. Center for Diabetes Research, Department of Clinical Science, University of Bergen , Bergen , Norway
4. Mohn Nutrition Research Laboratory, Department of Clinical Science, University of Bergen , Bergen , Norway
5. Hormone Laboratory, Haukeland University Hospital , Bergen , Norway