[1] Imperial Coll London, Natl Heart & Lung Inst, Asthma UK Ctr Appl Res, London, England
[2] Univ Edinburgh, Asthma UK Ctr Appl Res, Ctr Populat Hlth Sci, Edinburgh, Midlothian, Scotland
[3] Queen Mary Univ London, Wolfson Inst Populat Hlth, Asthma UK Ctr Appl Res, London, England
[4] Imperial Coll London, Dept Surg & Canc, London, England