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APA Citation
Lee, T. J. W., Blanks, R. G., Rutter, M. D., Moss, S. M., Goddard, A. F., Chilton, A., Nickerson, C., McNally, R. J. Q., Patnick, J., & Rees, C. J. (n.d.). efficacy and safety of colonoscopy in the UK NHS bowel cancer screening programme. Gut, 60, A22. http://access.bl.uk/ark:/81055/vdc_100135155713.0x000039