1. Institute of Cellular and Molecular Physiology; Friedrich-Alexander University Erlangen-Nürnberg; Erlangen Germany
2. Division of Endocrinology, Diabetology, Vascular Disease, Nephrology and Clinical Chemistry; Department of Internal Medicine; University Hospital Tübingen; Tübingen Germany
3. Institute of Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich; University of Tübingen; Tübingen Germany
4. German Center for Diabetes Research (DZD); University of Tübingen; Tübingen Germany
5. Division of Hematology and Oncology; University Hospitals Cleveland Medical Center; Cleveland OH USA
6. Case Western Reserve University; Cleveland OH USA
7. Joslin Diabetes Center; Boston MA USA