1. Center of Child and Adolescent Medicine, Justus Liebig University, Giessen, Germany
2. Department of Pediatrics, Kinderkrankenhaus Amsterdamer Strasse, Cologne, Germany
3. Diabetes Center for Children and Adolescents, Children’s Hospital Auf der Bult, Hannover, Germany
4. Department of Pediatrics, Saarland University Medical Center, Homburg/Saar, Germany
5. Department of Pediatrics, Technical University of Munich School of Medicine, Munich, Germany
6. Department of Pediatrics, University Hospital Erlangen, Erlangen, Germany
7. Institute of Epidemiology and Medical Biometry (ZIBMT), Ulm University, Ulm, Germany