1. Diabetes Centre, Department of Internal Medicine Amsterdam University Medical Centers, location VUmc Amsterdam The Netherlands
2. German Diabetes Center (DDZ), Leibniz Center for Diabetes Research Heinrich Heine University, Medical Faculty Düsseldorf Germany
3. German Center for Diabetes Research (DZD) Muenchen‐Neuherberg Germany
4. Department of Endocrinlogy Ghent University Hospital Ghent Belgium