BTS guidelines for investigation of unilateral pleural effusion in adults: Authors’ replyMaskell, N AButland, R J ADavies, R J OAuthor information1Southmead Hospital, North Bristol NHS Trust, UK2Gloucestershire Royal Hospital, Gloucestershire NHS Trust, UK3Churchill Hospital, Headington, Oxford, UKCorrespondence to: Dr N A Maskell Southmead Hospital, Westbury on Trym, Bristol BS10 5NB, UK; [email protected]Thorax 59(4):p 359, April 2004.Copyright © 2004 BMJ Publishing Group Ltd & British Thoracic Society