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Berkelmans PG, Berendsen AJ, Verhaak PF, van der Meer K.Berkelmans PG, et al.BMC Geriatr. 2010 Nov 2;10:80. doi: 10.1186/1471-2318-10-80.BMC Geriatr. 2010.PMID: 21044316Free PMC article.