. 2013 Jun 5;7(4):397–406. doi: 10.1111/crj.12026
© 2013 The Authors. The Clinical Respiratory Journal published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.