1. Department of Paediatric Oncology, Haematology and Immunology; University of Heidelberg Medical Centre; Heidelberg; Germany
2. European Molecular Biology Laboratory (EMBL); Heidelberg; Germany
3. Institute of Human Genetics; University of Heidelberg; Heidelberg; Germany
4. Endocrinology and Human Genetics Laboratory and Consultation Centre; Heidelberg; Germany
5. Department of Medical Genetics; University of Tuebingen; Tuebingen; Germany
6. Department of Paediatric Oncology and Haematology; Hannover Medical School; Hannover; Germany
7. Department of Paediatric Neurology; University of Heidelberg Medical Centre; Heidelberg; Germany