1. Experimental and Clinical Research Center; Charité Berlin Germany
2. Department of Paediatrics; Medical University of Vienna; Austria
3. Paediatric Endocrinology and Diabetes; Department of Paediatrics II; University Children's Hospital Essen; Germany
4. University Children's Hospital; MHH; Hannover Germany
5. Children's Hospital; University of Heidelberg; Germany
6. Department of General Paediatrics, Neonatology and Pediatric Cardiology; University Children's Hospital Düsseldorf; Germany
7. Paediatric Endocrinology Division; Children's Hospital; University of Bonn; Germany
8. Institute of Epidemiology and Medical Biometry; University of Ulm; Germany