Submitted on: 24 July 2011.
Revised on: 14 August 2011.
Accepted on: 08 October 2011.
___________________Current Geriatrics Reports---SPRINGER
Submitted on: 10 December 2011.
Revised on: 09 February 2012.
Accepted on: 28 February 2012.
___________________Current Geriatrics Reports---SPRINGER
http://reply.papertrans.cn/1/69/6896/6896-23.png
http://reply.papertrans.cn/1/69/6896/6896-24.png
http://reply.papertrans.cn/1/69/6896/6896-25.png
Submitted on: 18 March 1998.
Revised on: 27 June 1998.
Accepted on: 19 July 1998.
___________________Current Geriatrics Reports---SPRINGER
http://reply.papertrans.cn/1/69/6896/6896-27.png
Submitted on: 13 April 2014.
Revised on: 01 August 2014.
Accepted on: 27 August 2014.
___________________Current Geriatrics Reports---SPRINGER
Submitted on: 28 January 2011.
Revised on: 01 April 2011.
Accepted on: 11 April 2011.
___________________Current Geriatrics Reports---SPRINGER
http://reply.papertrans.cn/1/69/6896/6896-30.png