[1] Natl Inst Hlth, Dept Lab Med, Clin Ctr, Bethesda, MD USA
[2] Natl Inst Hlth, Hematol Sect, Dept Lab Med, Ctr Clin, Bethesda, MD USA
[3] Natl Inst Hlth, NIAID, Bethesda, MD USA
[4] Natl Inst Hlth, Chem Sect, Dept Lab Med, Ctr Clin, Bethesda, MD USA