[1] Univ N Carolina Hosp, Dept Internal Med, Div Hematol Oncol, McLendon Clin Labs,Transplanatat Serv, Chapel Hill, NC 27514 USA
[2] Univ N Carolina Hosp, Dept Internal Med, Div Hematol Oncol, McLendon Clin Labs,Transfus Med Serv, Chapel Hill, NC 27514 USA
[3] Univ N Carolina, Dept Pathol & Lab Med, Chapel Hill, NC USA