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Submitted on: 24 January 2012.
Revised on: 21 May 2012.
Accepted on: 15 July 2012.
___________________Gerontology and Geriatric Medicine
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Submitted on: 15 January 2011.
Revised on: 12 May 2011.
Accepted on: 07 June 2011.
___________________Gerontology and Geriatric Medicine
Submitted on: 04 January 1999.
Revised on: 10 April 1999.
Accepted on: 09 May 1999.
___________________Gerontology and Geriatric Medicine
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Submitted on: 28 October 2000.
Revised on: 23 November 2000.
Accepted on: 09 January 2001.
___________________Gerontology and Geriatric Medicine