[1] Baylor Coll Med, Dept Pediat, Sect Pediat Hematol Oncol, Houston, TX 77030 USA
[2] Texas Childrens Hosp, Texas Childrens Canc Ctr, Houston, TX 77030 USA
[3] Texas Childrens Hosp, Hematol Ctr, Houston, TX 77030 USA
[4] Univ Tennessee, Hlth Sci Ctr, Dept Oncol, Memphis, TN USA
[5] Univ Tennessee, Hlth Sci Ctr, St Jude Childrens Res Hosp, Dept Pathol, Memphis, TN USA
[6] Univ Tennessee, Hlth Sci Ctr, Dept Pediat, Memphis, TN USA