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References
- Des Jardins. Terry, Burton George. Clinical Manifestations & Assessment of Respiratory Disease Third Edition 1995
- Williams, Wilkins. Stedmans concise medical dictionary. Illustrated/ second Edition
- http://www.medicinenet.com/encyclop/ARTICLE/Art_C/ Cysticfi.htm
- http://www.cff.org/factsaco.htm
- http://cf-web.mit.edu/what-is-cf.ht ml
- http://www.phd.msu.edu/cf/art.html