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Waldron CA, van der Weijden T, Ludt S, Gallacher J, Elwyn G.Waldron CA, et al. Among authors: elwyn g.Patient Educ Couns. 2011 Feb;82(2):169-81. doi: 10.1016/j.pec.2010.04.014. Epub 2010 May 14.Patient Educ Couns. 2011.PMID: 20471766Review.