[1] Univ Bristol, Acad Resp Unit, Bristol, Avon, England
[2] North Bristol NHS Trust, Bristol, Avon, England
[3] Queen Elizabeth Univ Hosp, Glasgow, Lanark, Scotland
[4] Univ Glasgow, Inst Canc Sci, Glasgow, Lanark, Scotland
[5] Univ Oxford, Churchill Hosp, Resp Trials Unit, Oxford, England
[6] Churchill Hosp, Oxford Ctr Resp Med, Oxford, England
[7] Oxford Univ Hosp NHS Fdn Trust, Dept Oncol, Oxford, England
[8] Univ Glasgow, Inst Infect Immun & Inflammat, Glasgow, Lanark, Scotland