1. Division of Endocrinology, Diabetes, and Clinical Nutrition, University Hospital, Bern, Switzerland
2. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
3. Department of Internal Medicine, Cantonal Hospital, Olten, Switzerland
4. Institute of Clinical Chemistry, Kantonsspital, St. Gallen, Switzerland
5. Division of Endocrinology, Diabetes, and Clinical Nutrition, University Hospital, Basel, Switzerland