Submitted on: 08 November 2011.
Revised on: 09 December 2011.
Accepted on: 31 December 2011.
Multidisciplinary Respiratory Medicine
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http://reply.papertrans.cn/3/224/22390/22390-33.png
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Submitted on: 21 July 2015.
Revised on: 23 August 2015.
Accepted on: 14 September 2015.
Multidisciplinary Respiratory Medicine
http://reply.papertrans.cn/3/224/22390/22390-36.png