[1] Royal Brompton & Harefield Hosp, Interstitial Lung Dis Unit, London, England
[2] Imperial Coll London, Margaret Turner Warwick Ctr Fibrosing Lung Dis, NHLI, London, England
[3] Royal Brompton & Harefield Hosp, Dept Radiol, London, England
[4] Royal Brompton & Harefield Hosp, Dept Resp Med, London, England