Submitted on: 21 April 2005.
Revised on: 23 July 2005.
Accepted on: 29 August 2005.
___________________BMC Geriatrics---BMC
Submitted on: 05 November 2021.
Revised on: 04 January 2022.
Accepted on: 05 March 2022.
___________________BMC Geriatrics---BMC
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Submitted on: 24 October 2024.
Revised on: 07 January 2025.
Accepted on: 23 January 2025.
___________________BMC Geriatrics---BMC
http://reply.papertrans.cn/1/39/3889/3889-35.png
Submitted on: 05 January 2002.
Revised on: 10 February 2002.
Accepted on: 07 March 2002.
___________________BMC Geriatrics---BMC