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Journal of the American Geriatrics Society > 59 > 4 > 610 - 614
Journal of Clinical Epidemiology > 2001 > 54 > 8 > 851-856
Journal of the American Geriatrics Society > 59 > 4 > 610 - 614
Journal of Clinical Epidemiology > 2001 > 54 > 8 > 851-856