[1] Univ Ibadan, Dept Epidemiol & Med Stat, Coll Med, Ibadan, Nigeria
[2] Univ Ibadan, Dept Pharmacol & Therapeut, Coll Med, Ibadan, Nigeria
[3] Univ Ibadan, Epidemiol & Biostat Res Unit, Inst Adv Med Res & Training IMARAT, Coll Med, Ibadan, Nigeria
[4] Univ Ibadan, Fac Publ Hlth, Coll Med, Dept Hlth Promot & Educ, Ibadan, Nigeria
[5] Univ Ibadan, IMARAT, Fac Social Sci, Dept Sociol, Ibadan, Nigeria
[6] Minist Hlth, Child Hlth Div, Kampala, Uganda
[7] Grp Rech Act Sante, Ouagadougou, Burkina Faso
[8] WHO, UNICEF UNDP World Bank WHO Special Programme Res, Geneva, Switzerland
[9] Maastricht Univ, Sch Publ Hlth & Primary Care, Dept Hlth Serv Res, NL-6200 MD Maastricht, Netherlands
[10] Univ Gothenburg, Sahlgrenska Acad, Ctr Appl Biostat Occupat & Environm Med, Gothenburg, Sweden