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Köhler S, van Boxtel MP, van Os J, Thomas AJ, O'Brien JT, Jolles J, Verhey FR, Allardyce J.Köhler S, et al.J Am Geriatr Soc. 2010 May;58(5):873-9. doi: 10.1111/j.1532-5415.2010.02807.x. Epub 2010 Mar 30.J Am Geriatr Soc. 2010.PMID: 20374396