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Submitted on: 19 March 2003.
Revised on: 19 May 2003.
Accepted on: 25 June 2003.
___________________Human Resources for Health---BMC
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Submitted on: 26 February 2007.
Revised on: 13 April 2007.
Accepted on: 26 April 2007.
___________________Human Resources for Health---BMC
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Submitted on: 20 January 2005.
Revised on: 12 March 2005.
Accepted on: 25 April 2005.
___________________Human Resources for Health---BMC
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http://reply.papertrans.cn/2/117/11617/11617-29.png
Submitted on: 05 September 2015.
Revised on: 27 October 2015.
Accepted on: 22 December 2015.
___________________Human Resources for Health---BMC