[1] Univ Leicester, Inst Lung Hlth, NIHR Leicester Biomed Res Ctr, Leicester, England
[2] Univ Michigan, Dept Radiol, Ann Arbor, MI USA
[3] Univ Groningen, Gen Practitioners Res Inst, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD, Groningen, Netherlands
[4] Observat & Pragmat Res Inst, Singapore, Singapore
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Pulmonol, Groningen, Netherlands
[6] Univ Groningen, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD, Groningen, Netherlands
[7] Univ Groningen, Univ Med Ctr Groningen, Dept Epidemiol, Groningen, Netherlands
[8] Gen Practitioners Res Inst, Groningen, Netherlands
[9] Univ Groningen, Univ Med Ctr Groningen, Beatrix Childrens Hosp, Dept Pediat Pulmonol & Pediat Allergol, Groningen, Netherlands
[10] Univ Ferrara, Res Ctr Asthma & COPD, Ferrara, Italy
[11] Icahn Sch Med Mt Sinai, Dept Med, Mt Sinai Hlth Syst, New York, NY USA
[12] Univ Kiel, LungenClin Grosshansdorf, Kiel, Germany
[13] Univ Kiel, Dept Med, Kiel, Germany
[14] Univ Manchester, Univ Hosp South Manchester, Ctr Resp Med & Allergy, Manchester, England
[15] Chiesi Farmaceutici SpA, Global Clin Dev, Parma, Italy
[16] Imperial Coll, Natl Heart & Lung Inst, London, England