[1] Univ Manchester, Manchester Univ NHS Hosp Trust, Ctr Resp Med & Allergy, Manchester, Lancs, England
[2] Univ Arizona, Coll Med, Dept Med, Tucson, AZ USA
[3] Chiesi Farmaceut SpA, Parma, Italy
[4] Univ Groningen, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD, Dept Pulmonol, Groningen, Netherlands
[5] Univ Leicester, Inst Lung Hlth, NIHR Biomed Res Ctr, Leicester, Leics, England
[6] Univ Ferrara, Ferrara, Italy
[7] Univ Ferrara, Res Ctr Asthma & COPD, Ferrara, Italy
[8] Lungen Clin, Grosshansdorf, Germany
[9] Univ Kiel, Dept Med, Kiel, Germany
[10] Univ Groningen, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD, Dept Gen Practice, Groningen, Netherlands