1. From the Department of Hematology, Hospices Civils de Lyon and University Claude Bernard, Lyon, France; Division of Hematology/Oncology, Connecticut Children's Medical Center, Hartford, CT; Department of Oncology, St Jude Children's Research Hospital, Memphis, TN; The University of Texas M.D. Anderson Cancer Center, Houston, TX; and Division of Pediatric Hematology and Blood and Marrow Transplantation, Columbia University, New York, NY