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APA Citation
Hunt, A. J., Davies, P. M., Weatherburn, P., Coxon, A. P., & McManus, T. J. (1991). changes in sexual behaviour in a large cohort of homosexual men in England and Wales, 1988-9.. BMJ, 302(6775), 505–506. http://access.bl.uk/ark:/81055/vdc_100142300381.0x00004b