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Submitted on: 06 September 2011.
Revised on: 02 January 2012.
Accepted on: 15 January 2012.
___________________European Clinical Respiratory Journal
Submitted on: 04 August 2002.
Revised on: 29 September 2002.
Accepted on: 23 November 2002.
___________________European Clinical Respiratory Journal
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Submitted on: 03 June 1998.
Revised on: 21 July 1998.
Accepted on: 01 September 1998.
___________________European Clinical Respiratory Journal
Submitted on: 06 December 2024.
Revised on: 31 January 2025.
Accepted on: 26 March 2025.
___________________European Clinical Respiratory Journal