1. Institute of Epidemiology and Medical Biometry, Central Institute for Biomedical Technology, University of Ulm, Ulm, Germany.
2. German Center for Diabetes Research (DZD), Munich-Neuherberg, Germany.
3. Department of Internal Medicine, Diabetology and Angiology, DRK Hospital, Berlin, Germany.
4. Department of Gastroenterology and Diabetology, Heilig-Geist Hospital, Bensheim, Germany.
5. Diabetologikum DDG, Ludwigshafen, Germany.
6. Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.
7. Clinic for Endocrinology, Diabetology, Metabolism, and Nutrition Medicine, Regiomed Clinic Coburg, Coburg, Germany.
8. Specialized Diabetes Practice, Karlsruhe, Germany.
9. Specialized Diabetes Practice, Hanau, Germany.