[1] Univ Leicester, Leicester NIHR Biomed Res Ctr, Leicester, Leics, England
[2] European Resp Soc, Lausanne, Switzerland
[3] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[4] Athens Chest Hosp Sotiria, Resp Med Dept, Athens, Greece
[5] Athens Chest Hosp Sotiria, Asthma Ctr, Athens, Greece
[6] Ghent Univ Hosp, Dept Resp Med, Ghent, Belgium
[7] Erasmus MC, Dept Epidemiol, Rotterdam, Netherlands
[8] Erasmus MC, Dept Resp Med, Rotterdam, Netherlands