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APA Citation
Li, Z., Wu, S., Mai, J., Xu, K., Sun, Y., Song, Z., Jin, D., Wang, H., & Liu, P. (2014). prevalence of and Risk Factors for Pterygia in a Rural Northern Chinese Population. Ophthalmic epidemiology, 21, 378–383. http://access.bl.uk/ark:/81055/vdc_100024972774.0x00005d