1. Department of Internal Medicine, Hospital Center, Biel, Switzerland.
2. Clinical Trial Unit (CTU), University of Bern, Bern, Switzerland.
3. Division of Endocrinology, Diabetology and Metabolism, University Hospital of Lausanne and University of Lausanne, Lausanne, Switzerland.
4. Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism (UDEM), Inselspital, Bern University Hospital, Bern, Switzerland.