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Critical Leg Ischaemia Prevention Study (CLIPS) Group; Catalano M, Born G, Peto R.Critical Leg Ischaemia Prevention Study (CLIPS) Group, et al.J Intern Med. 2007 Mar;261(3):276-84. doi: 10.1111/j.1365-2796.2006.01763.x.J Intern Med. 2007.PMID: 17305650Free article.Clinical Trial.