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Kirk SF, Harvey EL, McConnon A, Pollard JE, Greenwood DC, Thomas JD, Ransley JK.Kirk SF, et al. Among authors: greenwood dc.BMC Health Serv Res. 2003 Oct 29;3(1):19. doi: 10.1186/1472-6963-3-19.BMC Health Serv Res. 2003.PMID: 14585107Free PMC article.Clinical Trial.