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Submitted on: 01 October 2006.
Revised on: 30 October 2006.
Accepted on: 16 November 2006.
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
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http://reply.papertrans.cn/3/203/20238/20238-14.png
Submitted on: 16 May 2009.
Revised on: 26 May 2009.
Accepted on: 14 June 2009.
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
Submitted on: 29 September 2006.
Revised on: 29 October 2006.
Accepted on: 06 November 2006.
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
http://reply.papertrans.cn/3/203/20238/20238-17.png
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Submitted on: 03 March 2009.
Revised on: 25 March 2009.
Accepted on: 31 March 2009.
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
Submitted on: 10 July 2010.
Revised on: 10 August 2010.
Accepted on: 21 August 2010.
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES