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The Gambia National Eye Health Survey 2019: survey protocol:

Hydara, Abba ; Bastawrous, Andrew ; Bell, Suzannah...
https://researchonline.lshtm.ac.uk/id/eprint/4663792/1/32f16e6a-72f0-4b7d-83be-aad52c3bc1e9_16531_-_islay_mactaggart_v2.pdf.  , 2021