1. Molecular Pharmacology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, USA
2. Department of Pediatric Oncology and Hematology, University Children's Hospital Essen, Germany
3. Department of Pediatric Oncology/Hematology, Charité- Universitätsmedizin Berlin, Germany
4. Sphingotec GmbH, Hennigsdorf, Germany
5. Center of Medical Genetics Ghent (CMGG), Ghent University Hospital, Belgium
6. German Consortium for Translational Cancer Research (DKTK), Partner Site Charite Berlin, Berlin, Germany