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Fletcher AE, Jones DA, Bulpitt CJ, Tulloch AJ.Fletcher AE, et al.BMC Health Serv Res. 2002 Oct 25;2(1):21. doi: 10.1186/1472-6963-2-21. Epub 2002 Oct 25.BMC Health Serv Res. 2002.PMID: 12398790Free PMC article.Clinical Trial.
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