Authors' response
John K Field, David Baldwin, Kate Brain, Anand Devaraj, Tim Eisen, Stephen W Duffy, David M Hansell, Keith Kerr, Richard Page, Mahash Parmar, David Weller, David Whynes, Paula Williamson
Thorax Jan 2013, 68 (1) 105; DOI: 10.1136/thoraxjnl-2012-202442