[1] Univ Ottawa, Inst Populat Hlth, Ottawa Hlth Res Inst, Ottawa, ON K1N 6N5, Canada
[2] Univ Ottawa, Inst Populat Hlth, Ctr Global Hlth, Ottawa, ON K1N 6N5, Canada
[3] Int Dev Res Ctr, Canada Tanzania Essential Hlth Intervent Project, CH-4002 Basel, Switzerland
[4] Swiss Trop Inst, CH-4002 Basel, Switzerland
[5] Sunnybrook & Womens Coll Hlth Sci Ctr, Toronto, ON M5S 1B2, Canada