1. Department of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
2. Department of Neuroendocrinology, University of Lübeck, Lübeck, Germany
3. Institute of Pharmaceutical Sciences, University of Tübingen, Tübingen, Germany
4. German Center for Diabetes Research (DZD), München-Neuherberg, Germany
5. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen (IDM), Tübingen, Germany