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Submitted on: 25 March 2017.
Revised on: 17 July 2017.
Accepted on: 17 August 2017.
___________________BMC Geriatrics---BMC
Submitted on: 12 June 2003.
Revised on: 16 July 2003.
Accepted on: 30 August 2003.
___________________BMC Geriatrics---BMC
Submitted on: 05 February 2006.
Revised on: 09 April 2006.
Accepted on: 24 May 2006.
___________________BMC Geriatrics---BMC
Submitted on: 29 March 2022.
Revised on: 15 July 2022.
Accepted on: 26 July 2022.
___________________BMC Geriatrics---BMC
Submitted on: 23 March 2000.
Revised on: 14 June 2000.
Accepted on: 01 August 2000.
___________________BMC Geriatrics---BMC
Submitted on: 22 October 2022.
Revised on: 27 November 2022.
Accepted on: 13 December 2022.
___________________BMC Geriatrics---BMC
http://reply.papertrans.cn/1/39/3888/3888-28.png
Submitted on: 05 November 2002.
Revised on: 11 January 2003.
Accepted on: 05 February 2003.
___________________BMC Geriatrics---BMC
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