Submitted on: 10 June 2003.
Revised on: 13 August 2003.
Accepted on: 04 October 2003.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 14 November 2008.
Revised on: 07 February 2009.
Accepted on: 08 March 2009.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 30 January 2019.
Revised on: 19 February 2019.
Accepted on: 01 April 2019.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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