Journal of Applied Gerontology (2013) - Comment
pubmed: 23526628  doi: 10.1177/0733464811409034  issn: 1552-4523  issn: 0733-4648 

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Katie E. Cherry, Erin Jackson Walker, Jennifer Silva Brown, Julia Volaufova, Lynn R. LaMotte, David A. Welsh, L. Joseph Su, S. Michal Jazwinski, Rebecca Ellis, Robert H. Wood, Madlyn I. Frisard