1. Children's Center for Cancer and Blood Diseases, Children's Hospital Los Angeles and Keck School of Medicine, University of Southern California, Los Angeles, CA;
2. Department of Epidemiology & Health Policy Research, College of Medicine, University of Florida, Gainesville, FL;
3. Children's Oncology Group, Arcadia, CA;
4. New York University Cancer Institute, New York, NY;
5. Department of Pediatrics, The Children's Hospital, and University of Colorado Cancer Center, Aurora, CO; and
6. Cancer Therapy Evaluation Program, National Cancer Institute, Bethesda, MD