1. Department for Endocrinology, Diabetology, Metabolic Diseases and Clinical Chemistry, University Hospital Heidelberg , 69120 Heidelberg , Germany
2. German Center for Diabetes Research (DZD) , 85764 Munich-Neuherberg , Germany
3. Department of General, Visceral and Transplant Surgery, University of Heidelberg , 69120 Heidelberg , Germany
4. Joint Heidelberg-IDC Translational Diabetes Program, Helmholtz Center Munich , 85764 Neuherberg , Germany
5. Helmholtz Center Munich, Institute for Diabetes and Cancer , 85764 Munich-Neuherberg , Germany