The Nigerian national blindness and visual impairment survey: Rationale, objectives and detailed methodology per Abiose Adenike, Elhassan Elizabeth, Gabriel Entekume, Ezelum Christian C, Abubakar Tafida, Mahdi Abdull M, Kyari Fatima, Rabiu Mansur, Gilbert Clare E, Dineen Brendan, Faal Hannah, Jiya Jonathan Y, Ozemela Chinenyem P, Lee Pak, Gudlavalleti Murthy VS

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