[1] Univ Ibadan, Coll Med, Dept Ophthalmol, Ibadan, Nigeria
[2] Univ Ibadan, Coll Med, Fac Publ Hlth, Dept Epidemiol & Med Stat, Ibadan, Nigeria
[3] Enugu State Univ Technol, Coll Med, Dept Ophthalmol, Enugu, Nigeria
[4] Eye Specialists Hosp TESH, Enugu, Nigeria
[5] Enugu State Univ Sci & Technol, ESUT Parklane, Enugu, Nigeria
[6] Ahmadu Bello Univ, Dept Ophthalmol Coll Med Sci, Zaria, Nigeria
[7] Univ Calabar, Coll Med Sci, Dept Ophthalmol, Calabar, Nigeria
[8] Abubakar Tafawa Balewa Univ, Dept Ophthalmol, Teaching Hosp, Bauchi, Nigeria
[9] Eye Fdn Hosp Grp, Lagos, Nigeria
[10] Lagos Univ, Dept Ophthalmol, Teaching Hosp, Lagos, Nigeria
[11] Olabisi Onabanjo Univ, Dept Ophthalmol, Teaching Hosp, Shagamu, Nigeria
[12] Univ Nigeria, Coll Med, Dept Ophthalmol, Ituku Ozalla, Nigeria
[13] Dent & Biomed Sci Queens Univ, Ctr Publ Hlth, Sch Med, Belfast, North Ireland
[14] Univ Zimbabwe, Dept Ophthalmol, Harare, Zimbabwe
[15] Sekuru Kaguvi Hosp, HARARE, Zimbabwe
[16] St Pauls Hosp Millennium Med Coll, Dept Biochem, Addis Ababa, Ethiopia
[17] Addis Ababa Univ, Dept Ophthalmol, SM, CHS, Addis Ababa, Ethiopia
[18] Sylvanus Olympio Univ Hosp, Lome, Togo
[19] Ctr Ophtalmologie Siloam Abidjan, Abidjan, Cote Ivoire
[20] Good Shepherd Hosp, Dept Ophthalmol, Siteki, Eswatini
[21] Eyes Africa, Lilongwe, Malawi
[22] HealthNetTPO, Bujumbura, Burundi
[23] Eye Ctr, East London, South Africa
[24] Univ Michigan, Med Sch, Dept Ophthalmol & Visual Sci, Ann Arbor, MI USA
[25] ORBIS Int, New York, NY USA
[26] Sun Yat Sen Univ, Zhongshan Ophthalm Ctr, Guangzhou, Peoples R China
[27] West Virginia Univ, Dept Ophthalmol & Visual Sci, Morgantown, WV USA