. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: J Cyst Fibros. 2013 Oct 31;13(2):156–163. doi: 10.1016/j.jcf.2013.10.007
© 2013 European Cystic Fibrosis Society. Published by Elsevier B.V. All rights reserved.