RT Journal Article SR Electronic T1 The Harlequin sign JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 605 OP 606 DO 10.1136/thoraxjnl-2015-206936 VO 70 IS 6 A1 Duneesha De Fonseka A1 Adriana Lama-Lopez A1 Tim Batchelor A1 Anthony Edey A1 Nicholas A Maskell YR 2015 UL http://thorax.bmj.com/content/70/6/605.abstract AB