1. Department of Internal Medicine, Division of Endocrinology, Diabetology, Angiology, Nephrology and Clinical Chemistry, Eberhard Karls University Tübingen, Tübingen, Germany
2. German Center for Diabetes Research (DZD), Neuherberg, Germany
3. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Centre Munich at the University of Tübingen, Tübingen, Germany
4. Institute of Experimental Genetics, Helmholtz Center Munich, Neuherberg, Germany
5. Department of Diagnostic and Interventional Radiology, Section on Experimental Radiology, Eberhard Karls University Tübingen, Tübingen, Germany
6. Chair of Experimental Genetics, Technical University Munich, Neuherberg, Germany
7. Institute of Pharmaceutical Sciences, Department of Pharmacy and Biochemistry, Eberhard Karls University Tübingen, Tübingen, Germany