1. Controlled clinical trials in cystic fibrosis — are we doing better?
Tracy Ann Briggs, Mandy Bryant, Rosalind L. Smyth 
Journal of Cystic Fibrosis 
Volume 5, Issue 1, Pages 3-8 (January 2006)
DOI: /j.jcf
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2. Fig. 1
The number of randomised controlled trials and clinical controlled trials in cystic fibrosis published between 1961 and 2002.
Journal of Cystic Fibrosis 2006 5, 3-8DOI: ( /j.jcf )
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