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2. The prevalence of glaucoma;Bengtsson;Br J Ophthalmol,1981a
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4. A study of the prevalence of eye disease in the elderly in a English community;Gibson;Trans Ophthalmol Soc UK,1985
5. Intra-ocular pressure, glaucoma and glaucoma suspects in a definied population;Hollows;Br J Ophthalmol,1966