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Ramke, J, Kuper, H, Limburg, H, Kinloch, J.M, Zhu, W, Lansingh, V.C, Congdon, N, Foster, A and Gilbert, C.E (2017) 'Avoidable waste in ophthalmic epidemiology: a review of blindness prevalence surveys in low and middle income countries 2000–2014.' Ophthalmic Epidemiology, 25 (1). pp. 13-20.