Submitted on: 02 November 2004.
Revised on: 22 February 2005.
Accepted on: 30 March 2005.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
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Submitted on: 01 July 2005.
Revised on: 23 September 2005.
Accepted on: 08 October 2005.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
Submitted on: 10 April 2010.
Revised on: 08 May 2010.
Accepted on: 23 May 2010.
___________________Chronic Obstructive Pulmonary Diseases-Journal of the COPD Foundation
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