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[Design of a multicentre randomized trial to evaluate felxible sigmoidoscopy in colorectal cancer screening]
Atkin WS, Edwards R, Wardle J, Northover JM, Sutton S, Hart AR, Williams CB, Cuzick J. [Design of a multicentre randomized trial to evaluate felxible sigmoidoscopy in colorectal cancer screening.] J Med Screen 2001;8(3):137-44