RT Journal Article SR Electronic T1 Once bitten, twice shy JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 56 OP 56 DO 10.1136/thx.2008.110973 VO 65 IS 1 A1 B D Fox A1 S Morgenstern A1 A Grubstein A1 S Pitlik A1 M R Kramer YR 2010 UL http://thorax.bmj.com/content/65/1/56.abstract AB