[1] Univ Oklahoma, Hlth Sci Ctr, Hematol Oncol Sect, Dept Med,Coll Med, Oklahoma City, OK 73190 USA
[2] Univ Oklahoma, Hlth Sci Ctr, Dept Biostat & Epidemiol, Coll Publ Hlth, Oklahoma City, OK USA
[3] Oklahoma Blood Inst, Oklahoma City, OK USA
[4] Pain Evaluat & Treatment Ctr, Tulsa, OK USA