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APA Citation
Garway-Heath, D. F., Ruben, S. T., Viswanathan, A., & Hitchings, R. A. (1998). vertical cup/disc ratio in relation to optic disc size: its value in the assessment of the glaucoma suspect. British journal of ophthalmology, 82(10), 1118–1124. http://access.bl.uk/ark:/81055/vdc_100135542139.0x000055