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Renehan AG, Egger M, Saunders MP, O'Dwyer ST.
Impact on survival of intensive follow up after curative resection for colorectal cancer: systematic review and meta-analysis of randomised trials
BMJ. 2002 Apr 6;324(7341):813
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McColl KE, Murray LS, Gillen D, Walker A, Wirz A, Fletcher J, Mowat C, Henry E, Kelman A, Dickson A
Randomised trial of endoscopy with testing for Helicobacter pylori compared with non-invasive H pylori testing alone in the management of dyspepsia
BMJ. 2002 Apr 27;324(7344):999-1002