http://reply.papertrans.cn/3/258/25775/25775-31.png
Submitted on: 30 April 2004.
Revised on: 28 May 2004.
Accepted on: 19 June 2004.
Public Health Ethics
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http://reply.papertrans.cn/3/258/25775/25775-34.png
Submitted on: 17 March 2005.
Revised on: 17 April 2005.
Accepted on: 09 May 2005.
Public Health Ethics
http://reply.papertrans.cn/3/258/25775/25775-36.png