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Malthaner RA, Wong RK, Rumble RB, Zuraw L; Members of the Gastrointestinal Cancer Disease Site Group of Cancer Care Ontario's Program in Evidence-based Care.Malthaner RA, et al.BMC Med. 2004 Sep 24;2:35. doi: 10.1186/1741-7015-2-35.BMC Med. 2004.PMID: 15447788Free PMC article.Review.