http://reply.papertrans.cn/2/132/13144/13144-11.png
Submitted on: 21 May 2017.
Revised on: 10 July 2017.
Accepted on: 29 August 2017.
___________________International Journal of Chronic Obstructive Pulmonary Disease
http://reply.papertrans.cn/2/132/13144/13144-13.png
Submitted on: 22 March 2006.
Revised on: 07 May 2006.
Accepted on: 14 June 2006.
___________________International Journal of Chronic Obstructive Pulmonary Disease
Submitted on: 13 December 2015.
Revised on: 22 January 2016.
Accepted on: 27 February 2016.
___________________International Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 02 September 2003.
Revised on: 27 December 2003.
Accepted on: 20 January 2004.
___________________International Journal of Chronic Obstructive Pulmonary Disease
Submitted on: 02 December 2018.
Revised on: 11 January 2019.
Accepted on: 24 January 2019.
___________________International Journal of Chronic Obstructive Pulmonary Disease
Submitted on: 16 December 2000.
Revised on: 24 March 2001.
Accepted on: 25 April 2001.
___________________International Journal of Chronic Obstructive Pulmonary Disease
Submitted on: 16 December 2006.
Revised on: 09 February 2007.
Accepted on: 28 March 2007.
___________________International Journal of Chronic Obstructive Pulmonary Disease