1. Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen , 2900 Hellerup , Denmark
2. Clinic of Gastroenterology , 3460 Birkerød , Denmark
3. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen , 2200 Copenhagen , Denmark
4. Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen , 2200 Copenhagen , Denmark
5. Steno Diabetes Center Copenhagen , 2730 Herlev , Denmark