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APA Citation
Xu, L., Li, J., Cui, T., Hu, A., Zheng, Y., Li, Y., Sun, B., Ma, B., & Jonas, J. B. (2005). visual acuity in northern China in an urban and rural population: the Beijing Eye Study. British journal of ophthalmology, 89(9), 1089–1093. http://access.bl.uk/ark:/81055/vdc_100150402623.0x00005d