1. Department of Pediatrics; University Hospital Jena; Jena Germany
2. Department of Epidemiology; University of Ulm; Ulm Germany
3. Department of Pediatrics; University Hospital Freiburg; Freiburg Germany
4. Pediatric Endocrinology and Diabetology; University Children's Hospital; Munich Germany
5. University Hospital for Children and Adolescents; University Leipzig; Leipzig Germany
6. Department of Pediatrics; University Hospital Homburg; Homburg Germany
7. Pediatric Endocrinology and Diabetes; Charité Berlin; Berlin Germany
8. Department of Pediatrics and Adolescent Medicine; Medical University of Vienna; Vienna Austria