1. Department of Gastroenterology and Diabetology; Klinikum Ludwigshafen; Ludwigshafen Germany
2. Institute for Pharmacology and Preventive Medicine; Mahlow Germany
3. Institute of Epidemiology and Medical Biometry, ZIBMT; University of Ulm; Ulm Germany
4. German Center for Diabetes Research (DZD); Neuherberg Germany
5. Diabeteszentrum für Kinder und Jugendliche; Kinderkrankenhaus auf der Bult; Hannover Germany
6. Diabetes Schwerpunktpraxis Rosenheim & Helmholtz Diabetes Center; Munich Germany
7. Gemeinschaftspraxis für Diabetologie, Innere Medizin und Allgemeinmedizin in Leverkusen; Leverkusen Germany
8. Department of Gastroenterology and Endocrinology; University Medical Center Goettingen; Goettingen Germany
9. Institute for Biometrics and Epidemiology; German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich-Heine-University; Düsseldorf Germany
10. Diabetologische Gemeinschaftspraxis Reuter, Reuter-Ehrlich, Schramm; Jena Germany
11. Division of Endocrinology and Diabetology, Department of Internal Medicine II; University Hospital of Freiburg, Faculty of Medicine, University of Freiburg; Freiburg Germany