[1] Emory Univ, Sch Med, Dept Med, Div Infect Dis, Atlanta, GA USA
[2] Emory Univ, Sch Med, Dept Pathol & Lab Med, Atlanta, GA 30322 USA
[3] Med Univ S Carolina, Pathol & Lab Med, Charleston, SC 29425 USA
[4] Ctr Dis Control & Prevent, Atlanta, GA USA