1. Institute of Epidemiology and Medical Biometry, ZIBMT, University of Ulm, Ulm, Germany
2. Department of Internal Medicine, Academic Hospital Paul Gerhardt Stift, Lutherstadt Wittenberg, Martin- Luther-University Halle-Wittenberg, Germany
3. Division of Endocrinology and Diabetology, Department of Internal Medicine II, University Hospital of Freiburg, Freiburg, Germany
4. Department of Diabetology and Infectiology, Medical Clinic I, Reutlingen, Germany
5. Division of Endocrinology, Diabetes and Metabolism, Graduate School of Molecular Diabetology and Endocrinology, Ulm University, Ulm, Germany
6. Specialized Diabetes Practice, Rosenheim, Germany
7. Diabetes Centre Forchheim, Germany
8. Specialized Diabetes Practice, Traunstein, Germany
9. Specialized Diabetes Practice, Bad Aibling, Germany
10. Department for General Internal Medicine, Endocrinology and Diabetes, HELIOS Kliniken Schwerin, Schwerin, Germany