[1] Univ Southampton, Sch Primary Care Populat Sci & Med Educ, Primary Care Res Ctr, Primary Med Care, Southampton, Hants, England
[2] NHS Gloucestershire Integrated Care Board, Gloucester, England
[3] Univ Oxford, Resp Med Unit, Resp Med, Oxford, England
[4] Univ Oxford, Oxford Resp NIHR Biomed Res Ctr, Nuffield Dept Clin Med, Oxford, England