[1] Kenyatta Natl Hosp, Res & Programs, Nairobi, Kenya
[2] Univ Washington, Dept Epidemiol, Seattle, WA USA
[3] Univ Washington, Dept Global Hlth, Seattle, WA USA
[4] Univ Washington, Biobehav Nursing & Hlth Informat, Seattle, WA USA
[5] Univ Washington, Med, Seattle, WA USA
[6] Univ Washington, Pediat, Seattle, WA USA