[1] Univ Kwazulu Natal, Sch Hlth Sci, African Vis Res Inst AVRI, ZA-3629 Durban, South Africa
[2] Western Sydney Univ, Translat Hlth Res Inst THRI, Campbelltown, NSW, Australia
[3] Queensland Univ Technol, Dept Optometry & Vis Sci, Brisbane, Qld, Australia
[4] Univ Calabar, Dept Publ Hlth, Fac Allied Med Sci, Coll Med Sci, Calabar, Cross River Sta, Nigeria
[5] Univ Cape Coast, Dept Optometry & Vis Sci, Sch Allied Hlth Sci, Cape Coast, Ghana
[6] Univ Jos, Coll Hlth Sci, Dept Psychiat, Jos, Nigeria
[7] Univ Bamenda, Hlth Div, Bamenda, Cameroon
[8] Cty Durham & Darlington Natl Hlth Serv NHS Fdn, Durham, England
[9] Masinde Muliro Univ Sci & Technol, Sch Publ Hlth Biomed Sci & Technol, Dept Optometry & Vis Sci, Kakamega, Kenya
[10] Tanzania Food & Nutr Ctr, Dar Es Salaam, Tanzania
[11] Curtin Univ, Curtin Business Sch, Sch Management & Mkt, Supply Chain Management, Perth, WA, Australia
[12] Univ Jos, Coll Hlth Sci, Dept Community Med, Jos, Plateau State, Nigeria
[13] Univ Jos, Dept Comp Sci, Jos, Plateau State, Nigeria
[14] Univ Highlands & Isl, Dept Optometry, Ctr Life Sci, Inverness IV2 3JH, Scotland
[15] Western Sydney Univ, Sch Hlth Sci, Sydney, NSW, Australia