1 Department of Endocrinology, Diabetes and Clinical Nutrition, University Department of Internal Medicine, Kantonsspital, CH-5001 Aarau, Switzerland.
2 Medical Faculty of the University of Basel, CH-4056 Basel, Switzerland.
3 Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, and University of Bern, CH-3008 Bern, Switzerland.