[1] Inst Hematol & Oncol Pediat, Lyon, France
[2] St Jude Childrens Res Hosp, Memphis, TN 38105 USA
[3] Inst Canc Res, Sutton, Surrey, England
[4] Royal Marsden Hosp, Sutton, Surrey, England
[5] Univ Colorado Denver, Div Med Oncol, Aurora, CO USA
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA
[7] Inst Curie, Paris, France
[8] Merck, N Wales, PA USA
[9] Inst Gustave Roussy, Villejuif, France