[1] Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA
[2] Univ Chicago, Chicago, IL 60637 USA
[3] Univ Calif Los Angeles, Med Ctr, Los Angeles, CA 90024 USA
[4] Stanford Univ, Med Ctr, Stanford, CA 94305 USA
[5] GlaxoSmithKline Inc, Collegeville, PA USA