Submitted on: 23 July 2000.
Revised on: 03 September 2000.
Accepted on: 04 October 2000.
___________________JOURNAL OF HEALTH ECONOMICS---ELSEVIER
Submitted on: 13 March 2018.
Revised on: 01 July 2018.
Accepted on: 19 July 2018.
___________________JOURNAL OF HEALTH ECONOMICS---ELSEVIER
Submitted on: 13 April 2012.
Revised on: 24 May 2012.
Accepted on: 14 June 2012.
___________________JOURNAL OF HEALTH ECONOMICS---ELSEVIER
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http://reply.papertrans.cn/2/172/17138/17138-35.png
Submitted on: 13 June 2004.
Revised on: 09 September 2004.
Accepted on: 26 October 2004.
___________________JOURNAL OF HEALTH ECONOMICS---ELSEVIER