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