1. Department of Internal Medicine IV, Division of Endocrinology and Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University Hospital of Tübingen
2. Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen
3. German Center for Diabetes Research (DZD)
4. Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen
5. Department of Internal Medicine, Deutsches Rotes Kreuz Kliniken Berlin