[1] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[2] Penn State Univ, Coll Med, Hershey, PA USA
[3] Univ Washington, Int Training & Educ Ctr HIV, Seattle, WA 98195 USA
[4] US Naval Med Res Ctr Detachment, Lima, Peru
[5] Univ Washington, Dept Global Hlth, Seattle, WA 98195 USA
[6] Univ Washington, Dept Med Infect Dis & Epidemiol, Seattle, WA 98195 USA
[7] US Govt, Washington, DC USA