[1] Univ N Carolina, Dept Hlth Policy & Management, 1101D McGavran Greenberg Hall,CB 7411, Chapel Hill, NC 27599 USA
[2] Univ Ghana, Sch Publ Hlth, Dept Social & Behav Sci, Accra, Ghana
[3] Univ N Carolina, Gillings Sch Global Publ Hlth, Dept Hlth Behav, Chapel Hill, NC USA
[4] Cognate Syst Co Ltd, Accra, Ghana
[5] Prediki Predict Markets GmbH, Vienna, Austria
[6] London Sch Hyg & Trop Med, Clin Res Dept, London, England
[7] UCL, Div Infect & Immun, London, England
[8] Univ N Carolina, Inst Global Hlth & Infect Dis, Chapel Hill, NC USA
[9] Univ Ghana, Noguchi Mem Inst Med Res, Accra, Ghana