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APA Citation
Atkin, W. S., Hart, A., Edwards, R., McIntyre, P., Aubrey, R., Wardle, J., Sutton, S., Cuzick, J., & Northover, J. M. A. (1998). uptake, yield of neoplasia, and adverse effects of flexible sigmoidoscopy screening. Gut, 42(4), 560–565. http://access.bl.uk/ark:/81055/vdc_100137792681.0x000049