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APA Citation
Garway-Heath, D. F., Rudnicka, A. R., Lowe, T., Foster, P. J., Fitzke, F. W., & Hitchings, R. A. (1998). measurement of optic disc size: equivalence of methods to correct for ocular magnification. British journal of ophthalmology, 82(6), 643–649. http://access.bl.uk/ark:/81055/vdc_100135153065.0x000054