1. Department of Endocrinology and Diabetology, Medical Faculty and University Hospital Heinrich Heine University Düsseldorf Germany
2. Institute for Clinical Diabetology, German Diabetes Center Leibniz Center for Diabetes Research at Heinrich Heine University Düsseldorf Düsseldorf Germany
3. German Center for Diabetes Research (DZD), Partner Düsseldorf München‐Neuherberg Germany
4. Department of Internal Medicine and Gastroenterology Niels Stensen Hospitals, Franziskus Hospital Harderberg Georgsmarienhütte Germany