[1] Univ Texas, MD Anderson Canc Ctr, Dept Leukemia, Houston, TX 77030 USA
[2] Univ Nebraska, Med Ctr, Hematol Oncol Sect, Dept Internal Med, Omaha, NE 68182 USA
[3] Univ Texas, MD Anderson Canc Ctr, Dept Biostat, Houston, TX 77030 USA
[4] Univ Texas, MD Anderson Canc Ctr, Dept Hematopathol, Houston, TX 77030 USA