[1] Univ Cincinnati, Dept Pathol & Lab Med, Cincinnati, OH USA
[2] Univ Texas MD Anderson Canc Ctr, Div Internal Med, Houston, TX 77030 USA
[3] Calif Inst Med Res, Infect Dis Res Lab, San Jose, CA 95128 USA
[4] Stanford Univ, Div Infect Dis & Geog Med, Stanford, CA 94305 USA