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Submitted on: 02 August 2004.
Revised on: 01 October 2004.
Accepted on: 28 November 2004.
___________________Applied Health Economics and Health Policy
Submitted on: 01 May 2010.
Revised on: 28 August 2010.
Accepted on: 14 September 2010.
___________________Applied Health Economics and Health Policy
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http://reply.papertrans.cn/1/23/2202/2202-35.png
Submitted on: 25 November 2010.
Revised on: 03 March 2011.
Accepted on: 22 March 2011.
___________________Applied Health Economics and Health Policy