1. Division of Pediatric Oncology Cincinnati Children's Hospital Medical Center, University of Cincinnati Cincinnati Ohio
2. Division of Urology Department of Surgery University of Colorado School of Medicinethe Children's Hospital Colorado Aurora Colorado
3. Department of Biostatistics, Children's Oncology Group Statistics and Data Center University of Florida Gainesville Florida
4. Department of Pathology Anne and Robert H. Lurie Children's HospitalUniversity of Michigan School of Medicine Ann Arbor Michigan
5. Department of Pathology Ann and Robert H. Lurie Children's Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago Illinois
6. Biostatistics and Research Decision Sciences Merck Research LaboratoriesMerck & Company Inc Rahway New Jersey
7. Department of Pediatric Oncology Dana‐Farber Cancer Institute/Boston Children's Hospital Boston Massachusetts
8. Division of Pediatric Surgery Steven and Alexandra Cohen Medical Center of New York New York New York
9. Mallinckrodt Institute of Radiology Washington University School of Medicine in St. Louis St. Louis Missouri
10. Department of Pediatrics The University of Texas MD Anderson Cancer Center Houston Texas
11. Section of Pediatric Surgery Department of Surgery C.S. Mott Children's HospitalUniversity of Michigan School of Medicine Ann Arbor Michigan
12. Division of Pediatric Oncology IWK Health CentreDalhousie University Halifax Nova Scotia Canada
13. Division of Pediatric Oncology Children's National HospitalGeorge Washington University School of Medicine and Health Sciences Washington DC