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Submitted on: 20 November 2011.
Revised on: 24 December 2011.
Accepted on: 13 February 2012.
___________________Family Medicine and Community Health
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Submitted on: 24 July 2002.
Revised on: 12 October 2002.
Accepted on: 03 November 2002.
___________________Family Medicine and Community Health
Submitted on: 21 February 2000.
Revised on: 18 March 2000.
Accepted on: 14 May 2000.
___________________Family Medicine and Community Health
Submitted on: 14 February 2000.
Revised on: 23 May 2000.
Accepted on: 23 June 2000.
___________________Family Medicine and Community Health
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http://reply.papertrans.cn/1/97/9647/9647-18.png
Submitted on: 03 June 2023.
Revised on: 24 September 2023.
Accepted on: 12 November 2023.
___________________Family Medicine and Community Health
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