[1] UNIV TENNESSEE, CTR HLTH SCI,COLL MED,DEPT PEDIAT, DIV HEMATOL ONCOL, MEMPHIS, TN 38163 USA
[2] UNIV TEXAS, SW MED CTR, DEPT PEDIAT, DALLAS, TX 75230 USA
[3] WASHINGTON UNIV, SCH MED, DEPT PEDIAT, ST LOUIS, MO 63110 USA
[4] ST LOUIS CHILDRENS HOSP, DIV HEMATOL ONCOL, ST LOUIS, MO 63178 USA
[5] GRP STAT OFF, GAINESVILLE, FL USA
[6] GRP OPERAT OFF, ST LOUIS, MO USA