[1] Fdn Policlin Gemelli, IRCCS, UOSD DH Gastroenterol, Rome, Italy
[2] Humanitas Univ, Dept Biomed Sci, Milan, Italy
[3] Univ Hosp Wishaw, Dept Resp Med, Wishaw, Scotland
[4] Johns Hopkins Univ, Div Pulm & Crit Care Med, Baltimore, MD USA
[5] GSK, Value Evidence & Outcomes, Collegeville, PA USA
[6] GSK, Biostat, Stevenage, Herts, England
[7] GSK, Epidemiol, GSK House, Brentford, England
[8] GSK, Value Evidence & Outcomes, Stevenage, Herts, England
[9] Univ Barcelona, IDIBAPS, CIBER Enfermedades Respiratorias CIBERES, Hosp Clin Barcelona,Secc Alergol,Serv Neumol & Al, Barcelona, Spain
[10] CIBER Enfermedades Resp CIBERES, IDIBAPS, Barcelona, Spain
[11] Clin Univ St Luc, Dept Pulm Med, Brussels, Belgium