Submitted on: 30 July 2019.
Revised on: 26 August 2019.
Accepted on: 19 September 2019.
Lancet Respiratory Medicine---ELSEVIER SCI LTD
Submitted on: 24 October 2017.
Revised on: 01 November 2017.
Accepted on: 25 November 2017.
Lancet Respiratory Medicine
http://reply.papertrans.cn/3/206/20519/20519-13.png
http://reply.papertrans.cn/3/206/20519/20519-14.png
Submitted on: 25 April 2003.
Revised on: 15 May 2003.
Accepted on: 29 May 2003.
Lancet Respiratory Medicine
Submitted on: 15 January 2001.
Revised on: 07 February 2001.
Accepted on: 25 February 2001.
Lancet Respiratory Medicine---ELSEVIER SCI LTD
http://reply.papertrans.cn/3/206/20519/20519-17.png
http://reply.papertrans.cn/3/206/20519/20519-18.png
http://reply.papertrans.cn/3/206/20519/20519-19.png
http://reply.papertrans.cn/3/206/20519/20519-20.png