Harries, Timothy H
Seed, Paul T
Jones, Simon
Schofield, Peter
White, Patrick
Article History
Received: 19 October 2013
Revised: 10 January 2014
Accepted: 8 February 2014
First Online: 20 May 2014
Competing interests
: PW has received project grants, consultancy fees, speaker fees and support for attending conferences from a number of pharmaceutical company manufacturers of respiratory drugs, but has no other financial relationships with any organisations that might have an interest in the submitted work. The remaining authors declare no conflict of interest.