[1] Mem Sloan Kettering Canc Ctr, Dept Med Leukemia Serv, New York, NY 10021 USA
[2] Univ Texas MD Anderson Canc Ctr, Leukemia Dept, Houston, TX 77030 USA
[3] Mem Sloan Kettering Canc Ctr, Dept Biostat & Epidemiol, New York, NY USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Leukemia, Houston, TX 77030 USA
[5] Mem Sloan Kettering Canc Ctr, Dept Med, Leukemia Serv, New York, NY 10021 USA