[1] Brown Univ, Div Infect Dis, Alpert Med Sch, Providence, RI 02912 USA
[2] Brown Univ, Ctr Stat Sci, Sch Publ Hlth, Providence, RI 02912 USA
[3] Acad Model Providing Access Healthcare AMPATH, Eldoret, Kenya
[4] Moi Univ, Dept Med, Sch Med, Coll Hlth Sci, Eldoret, Kenya