From the Department of Pediatrics (C.S.A.), Emory University, Atlanta, Georgia, U.S.A.; Department of Statistics (W.B.L.), University of Florida, Pediatric Oncology Group Statistical Office, Gainesville, Florida, U.S.A.; Department of Experimental Oncology (A.T.L.), St. Jude Children's Research Hospital, (S.T.R., M.B.N.) Memphis, Tennesse, U.S.A.; The Children's Hospital of Philadelphia, Department of Pediatrics (G.M.B.), University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A.; Department of Pathology (D.H.A.), University of Oklahoma, Oklahoma City, Oklahoma, U.S.A.; Department of Pediatric Laboratory Medicine, Division of Pathology, Hospital for Sick Children, and the University of Toronto (P.S.T.), Toronto, Canada; Department of Pathology and Laboratory Medicine (V.V.J.), Hartford Hospital, Hartford, Connecticut, U.S.A.; Department of Pediatric Surgery (E.I.S.), University of Texas, Southwestern Medical Center, Dallas, Texas, U.S.A.; Department of Pediatrics (R.P.C.), University of Alabama at Birmingham, Birmingham, Alabama, U.S.A.; and the Department of Pediatrics (S.L.C.), Northwestern University and Children's Memorial Hospital, Chicago, Illinois, U.S.A.
Submitted for publication August 27, 1999; accepted November 22, 1999.
Supported in part by grants #CA07431, CA31566, CA33625, CA69177, CA20549, CA25408, CA29139, CA30969 from the National Cancer Institute, Bethesda, Maryland and The Elise Anderson Neuroblastoma Fund (SLC).
Address correspondence and reprint requests to Dr. Carlos S. Alvarado, c/o Pediatric Oncology Group, 645 North Michigan Avenue, Suite 910, Chicago, IL 60611.
