1. Pediatrics, Hospital of Leverkusen, Leverkusen, Germany
2. Diabetes Center for Children and Adolescents, Children's Hospital auf der Bult, Hannover, Germany
3. Pediatrics, University of Freiburg, Freiburg, Germany
4. Pediatrics, University of Halle, Halle, Germany
5. Epidemiology, University of Ulm, Ulm. Germany