1. Division of Genetics; Children's Hospital of Philadelphia; Philadelphia, Pennsylvania
2. Department of Pathology and Laboratory Medicine; Children's Hospital of Philadelphia; Philadelphia, Pennsylvania
3. Division of Oncology; Children's Hospital of Philadelphia; Philadelphia, Pennsylvania
4. Department of Surgery; Children's Hospital of Philadelphia; Philadelphia, Pennsylvania
5. Department of Orthopedics; DuPont Hospital for Children; Wilmington, Delaware
6. Department of Pathology and Laboratory Medicine; Perelman School of Medicine, University of Pennsylvania; Philadelphia, Pennsylvania