[1] Gertrudes Childrens Hosp, Dept Res, 34 Muthaiga Rd, Nairobi 00100, Kenya
[2] Univ Witwatersrand, Fac Hlth Sci, Sch Publ Hlth, Div Epidemiol & Biostat, Johannesburg, South Africa
[3] Univ Bergen, Dept Global Publ Hlth & Primary Care, Bergen, Norway
[4] Univ Witwatersrand, Sch Publ Hlth, Fac Hlth Sci, MRC Wits Rural Publ Hlth & Hlth Transit Res Unit A, Johannesburg, South Africa
[5] Muhimbili Univ Hlth & Allied Sci, Directorate Lib Serv, Dar Es Salaam, Tanzania
[6] Wellstar Coll Hlth & Human Serv, Kennesaw, GA USA
[7] Duke Univ, Duke Global Hlth Inst, Global Emergency Med Innovat & Implementat Res Ctr, Duke Sch Med,Dept Emergency Med, Durham, NC USA
[8] Univ Witwatersrand, Fac Hlth Sci, Sch Clin Med, Dept Family Med & Primary Care, Johannesburg, South Africa