[1] North Bristol NHS Trust, Bristol Interstitial Lung Dis Serv, Bristol, Avon, England
[2] Univ Exeter, Sch Med, Exeter, Devon, England
[3] Musgrove Pk Hosp, Somerset Lung Ctr, Taunton, Somerset, England
[4] Royal Devon & Exeter NHS Fdn Trust, Resp Dept, Exeter, Devon, England
[5] Univ Leicester, Leicester Inst Struct & Chem Biol, NIHR Leicester BRC Resp, Leicester, Leics, England
[6] Univ Hosp Leicester NHS Trust, Glenfield Hosp, Inst Lung Hlth, Leicester, Leics, England