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Pahor M, Guralnik JM, Wan JY, Ferrucci L, Penninx BW, Lyles A, Ling S, Fried LP.Pahor M, et al.Am J Public Health. 1999 Jun;89(6):930-4. doi: 10.2105/ajph.89.6.930.Am J Public Health. 1999.PMID: 10358691Free PMC article.