[1] Kings Coll London, Ctr Implementat Sci Hlth Serv & Populat Res, David Goldberg Ctr, Inst Psychiat Psychol & Neurosci, De Crespigny Pk, London SE5 8AF, England
[2] Univ Witwatersrand, Ctr Hlth Policy, Sch Publ Hlth, 60 York Rd, ZA-2193 Johannesburg, South Africa
[3] Univ Sierra Leone, Coll Med & Allied Hlth Sci, Dept Microbiol, 12 Victoria St, Kossoh Town, Freetown, Sierra Leone
[4] 34 Mil Hosp, Joint Med Unit, Wilberforce Village, Freetown, Sierra Leone
[5] Univ Cape Town, Sch Publ Hlth & Family Med, Falmouth Bldg,Anzio Rd, ZA-7925 Cape Town, South Africa
[6] Kings Coll London, Fac Social Sci & Publ Policy, Sch Global Affairs, Dept Global Hlth & Social Med, London WC2R 2LS, England