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APA Citation
Steele, R. J. C., Kostourou, I., McClements, P., Watling, C., Libby, G., Weller, D., Brewster, D. H., Black, R., Carey, F. A., & Fraser, C. (2010). effect of repeated invitations on uptake of colorectal cancer screening using faecal occult blood testing: analysis of prevalence and incidence screening. BMJ, 341, . http://access.bl.uk/ark:/81055/vdc_100144728481.0x000038