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APA Citation
Petruckevitch, A., Nicoll, A., Johnson, A. M., & Bennett, D. (1997). direct estimates of prevalent HIV infection in adults in England and Wales for 1991 and 1993: an improved method.. Sexually transmitted infections, 73(5), 348–354. http://access.bl.uk/ark:/81055/vdc_100144469004.0x000002