1. Pediatric Endocrinology University Children's Hospital Tübingen Germany
2. Department of Pediatric Endocrinology, Diabetes and Nutrition Medicine Vestische Hospital for Children and Adolescents Datteln University of Witten/Herdecke Witten Germany
3. Institute of Clinical Epidemiology and Applied Biostatistics University of Tübingen Tübingen Germany
4. Genentech, Inc. South San Francisco CA USA