1. Division of Oncology, The Children's Hospital of Philadelphia Center for Childhood Cancer Research Philadelphia Pennsylvania 19104
2. Department of Pediatrics Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania 19104
3. Nucleic Acids and PCR Core Facility The Children's Hospital of Philadelphia Philadelphia Pennsylvania 19104
4. Current Affiliations: D.J.S., Center for Applied Genomics The Children's Hospital of Philadelphia; X.Y., School of Life Science and Biotechnology Shanghai Jiao Tong University Shanghai China
5. Biology Department University of Pennsylvania Philadelphia Pennsylvania 19104
6. Department of Pathology and Laboratory Medicine Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania 19104
7. Division of Genomic Diagnostics Children's Hospital of Philadelphia Philadelphia Pennsylvania 19104
8. Department of Pathology and Laboratory Medicine The Children's Hospital of Philadelphia Philadelphia Pennsylvania 19104
9. Department of Pediatrics Memorial Sloan Kettering Cancer Center New York New York 10021