[1] Univ Toronto, Ctr Global Hlth, Dalla Lana Sch Publ Hlth, 155 Coll St, Toronto, ON M5T 3M7, Canada
[2] Moi Univ, Coll Hlth Sci, Sch Publ Hlth, Div Epidemiol, Eldoret, Kenya
[3] Acad Model Providing Access Healthcare, Eldoret, Kenya
[4] African Populat & Hlth Res Ctr, POB 10787, Nairobi 00100, Kenya
[5] Icahn Sch Med Mt Sinai, Arnhold Inst Global Hlth, Dept Global Hlth & Hlth Syst Design, New York, NY 10029 USA