Submitted on: 18 December 2020.
Revised on: 20 February 2021.
Accepted on: 08 March 2021.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
Submitted on: 04 February 2024.
Revised on: 08 April 2024.
Accepted on: 10 May 2024.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
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Submitted on: 19 May 2011.
Revised on: 29 August 2011.
Accepted on: 27 October 2011.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
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Submitted on: 13 January 2004.
Revised on: 05 March 2004.
Accepted on: 23 March 2004.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
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