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Sharkey JR, Horel S, Dean WR.Sharkey JR, et al.Int J Health Geogr. 2010 May 25;9:26. doi: 10.1186/1476-072X-9-26.Int J Health Geogr. 2010.PMID: 20500853Free PMC article.
Sharkey JR, Johnson CM, Dean WR.Sharkey JR, et al.BMC Geriatr. 2010 Jun 2;10:32. doi: 10.1186/1471-2318-10-32.BMC Geriatr. 2010.PMID: 20525208Free PMC article.