作者单位:London Sch Hyg & Trop Med, Clin Res Unit, Dept Infect & Trop Dis, London WC1, England[1]Univ Sydney, Sydney Med Sch, George Inst Global Hlth, Sydney, NSW 2006, Australia[2]Univ New S Wales, Sch Publ Hlth & Community Med, Sydney, NSW, Australia[3]Univ New S Wales, Sch Social Sci, Fac Arts & Social Sci, Sydney, NSW, Australia[4]