1 German Center for Diabetes Research (DZD), Neuherberg, Germany. andreas.birkenfeld@med.uni-tuebingen.de.
2 Department of Internal Medicine IV, Diabetology, Endocrinology and Nephrology, Eberhard-Karls University Tübingen, Tübingen, Germany. andreas.birkenfeld@med.uni-tuebingen.de.
3 Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, Tübingen, Germany. andreas.birkenfeld@med.uni-tuebingen.de.
4 Department of Diabetes, Life Sciences & Medicine Cardiovascular Medicine & Sciences, King's College London, London, UK. andreas.birkenfeld@med.uni-tuebingen.de.
5 Madras Diabetes Research Foundation, Chennai, India.
6 Dr. Mohan's Diabetes Specialities Centre, Chennai, India.