Submitted on: 20 March 2000.
Revised on: 14 May 2000.
Accepted on: 25 May 2000.
___________________Journal of Cystic Fibrosis---ELSEVIER
Submitted on: 18 June 2018.
Revised on: 10 August 2018.
Accepted on: 10 September 2018.
___________________Journal of Cystic Fibrosis---ELSEVIER
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Submitted on: 15 September 2012.
Revised on: 07 December 2012.
Accepted on: 22 December 2012.
___________________Journal of Cystic Fibrosis---ELSEVIER