1. Department of Internal Medicine (M.K., F.M., H.-U.H., E.S., A.P.), Division of Endocrinology, Diabetology, Angiology, Nephrology, Clinical Chemistry and Pathobiochemistry, University of Tübingen, 72076 Tübingen, Germany
2. Department of General, Visceral and Transplant Surgery (I.K., A.K.), University of Tübingen, 72076 Tübingen, Germany
3. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen (F.M., H.-U.H., E.S., A.P.), 72076 Tübingen, Germany
4. German Center for Diabetes Research (DZD) (F.M., H.-U.H., E.S., A.P.), 85764 München-Neuherberg, Germany