[1] NIAID, Lab Clin Infect Dis, NIH, 9000 Rockville Pike, Bethesda, MD 20892 USA
[2] NIH, Hematopathol Sect, Bldg 10, Bethesda, MD 20892 USA
[3] NCI, Lab Pathol, Bethesda, MD 20892 USA
[4] Ctr Clin, Dept Lab Med, Hematol Serv, Bethesda, MD USA
[5] NIDDK, Bethesda, MD 20892 USA
[6] Childrens Hosp Philadelphia, Div Allergy & Immunol, Philadelphia, PA 19104 USA