- Correspondence to Dr Helmy Haja Mydin, Department of Respiratory Medicine, Aberdeen Royal Infirmary, Aberdeen AB25 2ZN, UK;
- Received May 22, 2013
- Revised September 14, 2013
- Accepted October 31, 2013
- First published November 18, 2013.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.