1. Institute for Clinical Diabetology; German Diabetes Center; Leibniz Institute for Diabetes Research; Heinrich Heine University; Düsseldorf Germany
2. German Center for Diabetes Research (DZD e.V.); Düsseldorf Germany
3. Dipartimento di Scienze Farmacologiche e Biomolecolari (DISFeB); Università degli Studi di Milano; Milan Italy
4. IRCCS Multimedica; Milan Italy
5. Department of Endocrinology and Diabetology; Medical Faculty; Heinrich Heine University; Düsseldorf Germany