1. Department of Internal Medicine, Division of Diabetology, Endocrinology and Nephrology, University Hospital Tübingen, Germany
2. Faculty of Health Sciences, Ontario Tech University, Oshawa, ON, Canada
3. Institute of Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen
4. German Center for Diabetes Research at the University of Tübingen, Tübingen, Germany