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Lu, Q; He, W; Murthy, GVS; He, XD; Congdon, N; Zhang, LR; LI, L; Yang, JA; (2011) Presbyopia and Near-Vision Impairment in Rural Northern China. Investigative ophthalmology & visual science, 52 (5). pp. 2300-2305. ISSN 0146-0404 DOI: https://doi.org/10.1167/iovs.10-6569