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Hoff G, Grotmol T, Skovlund E, Bretthauer M; Norwegian Colorectal Cancer Prevention Study Group.Hoff G, et al. Among authors: grotmol t.BMJ. 2009 May 29;338:b1846. doi: 10.1136/bmj.b1846.BMJ. 2009.PMID: 19483252Free PMC article.Clinical Trial.
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