[1] Univ Lagos, Dept Community Hlth & Primary Care, Coll Med, Lagos, Nigeria
[2] Univ Greenwich, Sch Human Sci, London, England
[3] London Sch Hyg & Trop Med, Dept Infect Dis & Epidmiol, London, England
[4] Northwestern Univ, Dept Med, Feinberg Sch Med, Chicago, IL USA
[5] York Univ, Sch Global Hlth, Toronto, ON, Canada