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German Center for Diabetes Research (DZD e.V.), Germany; Institute for Diabetes Research and Metabolic Diseases IDM of the Helmholtz Center Munich at the Eberhard-Karls-University of Tübingen, Germany; University Hospital Tübingen, Internal Medicine IV, Endocrinology, Diabetology, Angiology, Nephrology and Clinical Chemistry, Otfried-Müller-Str. 10, 72076 Tübingen, Germany. Electronic address: