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APA Citation
Saw, S., Goh, P., Cheng, A., Shankar, A., Tan, D. T. H., & Ellwein, L. B. (2006). ethnicity-specific prevalences of refractive errors vary in Asian children in neighbouring Malaysia and Singapore. British journal of ophthalmology, 90(10), 1230–1235. http://access.bl.uk/ark:/81055/vdc_100135552704.0x000052