1 German Center for Diabetes Research (DZD e. V.), Neuherberg, Germany; Institute of Diabetes Research and Metabolic Disease (IDM) of the Helmholtz Center Munich, University of Tübingen, Tübingen, Germany; Department of Internal Medicine IV, Endocrinology, Diabetology and Nephrology, University Hospital Tübingen, Tübingen, Germany.
2 German Center for Diabetes Research (DZD e. V.), Neuherberg, Germany; Institute of Diabetes Research and Metabolic Disease (IDM) of the Helmholtz Center Munich, University of Tübingen, Tübingen, Germany; Department of Internal Medicine IV, Endocrinology, Diabetology and Nephrology, University Hospital Tübingen, Tübingen, Germany; Department of Pharmacology & Toxicology, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt.
3 German Center for Diabetes Research (DZD e. V.), Neuherberg, Germany; Institute of Diabetes Research and Metabolic Disease (IDM) of the Helmholtz Center Munich, University of Tübingen, Tübingen, Germany; Department of Internal Medicine IV, Endocrinology, Diabetology and Nephrology, University Hospital Tübingen, Tübingen, Germany; School of Cardiovascular and Metabolic Medicine & Sciences, King's College London, London, UK; Medizinische Klinik und Poliklinik III, Medizinische Fakultät der Technischen Universität Dresden, Dresden, Germany. Electronic address: Andreas.birkenfeld@med.uni-tuebingen.de.