[1] Hosp Univ Vall DHebron, Dept Pneumol, Barcelona, Spain
[2] McMaster Univ, Firestone Inst Resp Hlth, Hamilton, ON, Canada
[3] Chinese Univ Hong Kong, Dept Paediat, Hong Kong, Hong Kong, Peoples R China
[4] Univ Illinois, Med & Publ Hlth, Chicago, IL USA
[5] Univ Colorado, Skaggs Sch Pharm & Pharmaceut Sci, Denver, CO 80202 USA
[6] Skane Univ Hosp, Resp Med & Allergol, Lund, Sweden
[7] Natl Jewish Hlth, Med, Denver, CO USA
[8] Univ Aberdeen, Primary Care Resp Med, Aberdeen, Scotland
[9] Resp Effectiveness Grp, Steering Grp, Cambridge, England
[10] Res Real Life Ltd, Stat & Hlth Outcomes, Cambridge, England