1. Department of Pediatric Endocrinology, Diabetes and Nutrition Medicine Vestische Hospital for Children and Adolescents Datteln University of Witten/Herdecke Datteln Germany
2. Division of Pediatric Endocrinology and Diabetes Department of Pediatrics University Hospital of Schleswig – Holstein Campus Kiel / Christian – Albrechts University of Kiel Kiel Germany
3. Institute of Epidemiology and Medical Biometry German Center for Diabetes Research University of Ulm Ulm Germany