[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pathol & Lab Med, Los Angeles, CA 90095 USA
[2] Univ Washington, Harborview Med Ctr, GISP Reg Lab, Neisseria Reference Lab, Seattle, WA 98195 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Ctr World Hlth, Div Infect Dis, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Dept Epidemiol, Los Angeles, CA 90095 USA
[5] Univ Calif Los Angeles, Fielding Sch Publ Hlth, Los Angeles, CA 90024 USA