Submitted on: 19 April 2002.
Revised on: 04 July 2002.
Accepted on: 30 July 2002.
___________________Geriatrics---MDPI
Submitted on: 04 November 2008.
Revised on: 13 January 2009.
Accepted on: 23 January 2009.
___________________Geriatrics---MDPI
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Submitted on: 02 December 2016.
Revised on: 03 March 2017.
Accepted on: 01 May 2017.
___________________Geriatrics---MDPI
Submitted on: 29 August 1999.
Revised on: 03 December 1999.
Accepted on: 24 December 1999.
___________________Geriatrics---MDPI
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