[1] Stanford Univ, Med Ctr, Sch Med, Dept Pathol, Stanford, CA 94305 USA
[2] Stanford Univ, Sch Med, Dept Med, Div Hematol, Stanford, CA 94305 USA
[3] Univ Alberta Hosp, Dept Lab Med & Pathol, Edmonton, AB T6G 2R7, Canada
[4] Oregon Hlth & Sci Univ, Dept Pathol, Portland, OR 97201 USA
[5] Med Univ Vienna, Dept Internal Med 1, Div Hematol, Vienna, Austria