[1] Stanford Univ, Sch Med, Dept Pathol, Stanford, CA 94305 USA
[2] Univ Michigan, Sch Med, Dept Pathol, Ann Arbor, MI 48109 USA
[3] Stanford Hlth Care, Patient Care Serv, Stanford, CA 94305 USA
[4] Stanford Univ, Sch Med, Dept Med, Div Infect Dis & Geog Med, Stanford, CA 94305 USA
[5] Stanford Hlth Care, Clin Microbiol Lab, Stanford, CA 94305 USA