[1] ORBIS Int, New York, NY USA
[2] Emory Univ, Dept Ophthalmol, Global Ophthalmol Emory, Atlanta, GA 30322 USA
[3] RTI, Abuja, Nigeria
[4] Sightsavers, Haywards Heath, England
[5] Univ Cape Town, Kilimanjaro Ctr Community Ophthalmol, Cape Town, South Africa