Submitted on: 03 November 2003.
Revised on: 28 February 2004.
Accepted on: 28 April 2004.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 02 November 2017.
Revised on: 19 February 2018.
Accepted on: 10 April 2018.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 25 April 2003.
Revised on: 25 June 2003.
Accepted on: 12 August 2003.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease
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Submitted on: 20 November 2021.
Revised on: 26 February 2022.
Accepted on: 20 April 2022.
___________________COPD-Journal of Chronic Obstructive Pulmonary Disease