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Marshall EG, Clarke BS, Varatharasan N, Andrew MK.Marshall EG, et al. Among authors: varatharasan n.Can Geriatr J. 2015 Mar 31;18(1):2-10. doi: 10.5770/cgj.18.122. eCollection 2015 Mar.Can Geriatr J. 2015.PMID: 25825606Free PMC article.