1. Department of Internal Medicine, Division of Endocrinology, Diabetology, Vascular Disease, Nephrology and Clinical Chemistry University Hospital Tübingen Tübingen Germany
2. Institute of Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University Tübingen Tübingen Germany
3. German Center for Diabetes Research (DZD) at the University Tübingen Tübingen Germany
4. Institute of Cellular and Molecular Physiology Friedrich‐Alexander University Erlangen‐Nürnberg (FAU) Bayern Germany
5. Institute of Basic Medical Sciences University of Oslo Oslo Norway
6. Institute of Anatomy University of Regensburg Regensburg Germany