RT Journal Article SR Electronic T1 Unexpected migration JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP thoraxjnl-2017-210866 DO 10.1136/thoraxjnl-2017-210866 A1 Gayatri Raghuram A1 Dipak Mukherjee A1 Kanwar Pannu A1 Sudhir Bhusari YR 2017 UL http://thorax.bmj.com/content/early/2017/12/06/thoraxjnl-2017-210866.abstract AB