[1] Univ British Columbia, St Pauls Hosp, Dept Ophthalmol, British Columbia Ctr Epidemiol & Int Ophthalmol, Vancouver, BC V6Z 1Y6, Canada
[2] Royal Liverpool Univ Hosp, St Pauls Eye Unit, Liverpool, Merseyside, England
[3] Natl Eye Care Project, Banjul, Gambia
[4] Western Eye Hosp, London, England
[5] Univ Malawi, Coll Med, Wellcome Trust Labs, Zomba, Malawi
[6] Univ Malawi, Coll Med, Malaria Project, Zomba, Malawi
[7] Univ Liverpool, Sch Trop Med, Liverpool L69 3BX, Merseyside, England
[8] Kenya Med Res Inst, Clin Res Ctr, Kilifi, Kenya
[9] MRC Labs, Banjul, Gambia
[10] Mahidol Univ, Fac Trop Med, Bangkok, Thailand
[11] Michigan State Univ, Coll Osteopath Med, E Lansing, MI 48824 USA