[1] Peking Univ First Hosp, Dept Gen Practice, Beijing 100034, Peoples R China
[2] Capital Med Univ, Beijing Friendship Hosp, Dept Emergency, Beijing 100050, Peoples R China
[3] Peking Univ Third Hosp, Pulm & Crit Care Med, Beijing 100191, Peoples R China
[4] Peking Univ, Res Ctr Chron Airway Dis, Hlth Sci Ctr, Beijing, Peoples R China
[5] Univ Birmingham, Inst Appl Hlth Res, Birmingham B15 2TT, W Midlands, England
[6] Queen Elizabeth Hosp, Lung Funct & Sleep, Birmingham B15 2WB, W Midlands, England
[7] Int Primary Care Resp Grp, Aberdeen, Scotland
[8] Univ Minho, Sch Med, Life & Hlth Sci Res Inst ICVS, Braga, Portugal
[9] PT Govt Associate Lab, ICVS 3Bs, Braga, Portugal
[10] Georgian Resp Assoc, Tbilisi, Georgia
[11] Petre Shotadze Tbilisi Med Acad, Tbilisi, Georgia
[12] Ivane Javakhisvhili Tbilisi State Univ, Tbilisi, Georgia
[13] ABC Med Sch, Family Med, Sao Paulo, Brazil
[14] Univ Hosp Birmingham NHS Fdn Trust, NIHR Birmingham Biomed Res Ctr, Birmingham, W Midlands, England
[15] Univ Birmingham, Birmingham, W Midlands, England
[16] Ss Cyril & Methodius Univ Skopje, Fac Med, Ctr Family Med, Skopje, North Macedonia
[17] Univ Sao Paulo, Fac Med, Sao Paulo, Brazil
[18] Univ Birmingham, Inst Inflammat & Ageing, Birmingham B15 2TT, W Midlands, England