[1] NHS Clin Res Facil, Glasgow, Scotland
[2] AstraZeneca, Gaithersburg, MD USA
[3] Observat & Pragmat Res Inst, Singapore, Singapore
[4] Montpellier Univ Hosp, Arnaud Villeneuve Hosp, Dept Resp Dis, Montpellier, France
[5] Royal Brompton & Harefield Hosp, UK Severe Asthma Network & Natl Registry, London, England
[6] Kings Coll London, Guys & St Thomas NHS Trust, UK Severe Asthma Network & Natl Registry, London, England
[7] Kings Coll London, Div Asthma Allergy & Lung Biol, London, England
[8] AstraZeneca, Cambridge, England
[9] Univ Aberdeen, Ctr Acad Primary Care, Div Appl Hlth Sci, Aberdeen, Scotland