Submitted on: 29 January 2014.
Revised on: 11 April 2014.
Accepted on: 20 May 2014.
___________________JAMA Health Forum---AMER MEDICAL ASSOC
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http://reply.papertrans.cn/2/148/14799/14799-33.png
Submitted on: 06 October 2014.
Revised on: 03 December 2014.
Accepted on: 31 December 2014.
___________________JAMA Health Forum---AMER MEDICAL ASSOC
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http://reply.papertrans.cn/2/148/14799/14799-36.png