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Guise JM, Hansen M, Lambert W, O'Brien K.Guise JM, et al. Among authors: lambert w.BMC Health Serv Res. 2017 May 4;17(1):322. doi: 10.1186/s12913-017-2255-7.BMC Health Serv Res. 2017.PMID: 28472958Free PMC article.