1. From the Department of Pediatrics, Dana-Farber Cancer Institute; Division of Medicine, Children’s Hospital Boston; Department of Pediatrics, Department of Orthopedic Surgery, Harvard Medical School; and Massachusetts General Hospital, Boston, MA; Surgical Oncology Branch and Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD; Department of Statistics, University of Florida, and Pediatric Oncology Group Statistical Office, Gainesville, FL; Department of...