[1] Univ Calif Berkeley, Sch Publ Hlth, CERCH, Berkeley, CA 94720 USA
[2] Univ Venda, Dept Psychol, Venda, South Africa
[3] Univ Pretoria, Inst Sustainable Malaria Control, Pretoria, South Africa
[4] Univ Pretoria, Sch Hlth Syst & Publ Hlth, Pretoria, South Africa
[5] Univ Pretoria, Dept Urol, Pretoria, South Africa
[6] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada