1. Institute for Clinical Diabetology at German Diabetes Center; Leibniz Center for Diabetes Research at Heinrich-Heine-University; Düsseldorf; Germany
2. Institute of Molecular Medicine; Heinrich-Heine University; Düsseldorf; Germany
3. University Children's Hospital; Ljubljana; Slovenia
4. Division of Pediatrics, Department of Clinical and Experimental Medicine; University of Linköping; Linköping; Sweden
5. University Campus BioMedico; Rome; Italy