RT Journal Article SR Electronic T1 Aetiology and repair of tracheal stenosis following tracheostomy and intermittent positive pressure respiration. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1 OP 6 DO 10.1136/thx.22.1.1 VO 22 IS 1 A1 P Gibson YR 1967 UL http://thorax.bmj.com/content/22/1/1.abstract AB