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Armfield NR, Coulthard MG, Slater A, McEniery J, Elcock M, Ware RS, Scuffham PA, Bensink ME, Smith AC.Armfield NR, et al.BMC Health Serv Res. 2014 Nov 11;14:546. doi: 10.1186/s12913-014-0546-9.BMC Health Serv Res. 2014.PMID: 25381774Free PMC article.Clinical Trial.