Pfeffer Paul E, Sen Arjune, Das Satya, Sheaff Michael, Sivaramakrishnan Anand, Simcock David E, Turner Benjamin
Department of Respiratory Medicine, Royal London Hospital, London E1 1BB, UK.
Thorax. 2010 Dec;65(12):1066, 1085. doi: 10.1136/thx.2010.140350. Epub 2010 Oct 1.