Submitted on: 09 October 2013.
Revised on: 06 November 2013.
Accepted on: 19 November 2013.
Lancet Public Health---ELSEVIER SCI LTD
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Submitted on: 03 September 2005.
Revised on: 05 October 2005.
Accepted on: 11 October 2005.
Lancet Public Health---ELSEVIER SCI LTD
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Submitted on: 04 June 2013.
Revised on: 04 July 2013.
Accepted on: 13 July 2013.
Lancet Public Health
http://reply.papertrans.cn/3/206/20509/20509-16.png
Submitted on: 20 January 2015.
Revised on: 02 February 2015.
Accepted on: 09 February 2015.
Lancet Public Health
Submitted on: 25 October 2003.
Revised on: 23 November 2003.
Accepted on: 04 December 2003.
Lancet Public Health
http://reply.papertrans.cn/3/206/20509/20509-19.png
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