[1] UNC Project, Lilongwe, Malawi
[2] Univ N Carolina, Dept Epidemiol, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27515 USA
[3] FHI 360, Monrovia, Liberia
[4] Lighthouse Trust, Lilongwe, Malawi
[5] Ohio State Univ, Coll Publ Hlth, Div Epidemiol, Columbus, OH 43210 USA
[6] Univ N Carolina, Div Infect Dis, Chapel Hill, NC 27515 USA