[1] Natl Jewish Hlth, Div Pulm Crit Care & Sleep Med, Denver, CO USA
[2] Natl Jewish Hlth, Div Allergy & Clin Immunol, Denver, CO USA
[3] Humanitas Univ & Res Hosp, Personalized Med Asthma & Allergy Clin, Milan, Italy
[4] Peninsula Coll Med & Dent, Plymouth, Devon, England
[5] Queens Univ Belfast, UK Severe Asthma Registry, Belfast, Antrim, North Ireland
[6] Barts Hlth NHS Trust, UK Severe Asthma Network, London, England
[7] Barts Hlth NHS Trust, Natl Registry, London, England
[8] Guys & St Thomas NHS Trust, UK Severe Asthma Network, London, England
[9] Guys & St Thomas NHS Trust, Natl Registry, London, England
[10] Kings Coll London, Div Asthma Allergy & Lung Biol, London, England
[11] Royal Brompton & Harefield NHS Fdn Trust, UK Severe Asthma Network, London, England
[12] Royal Coll Surgeons Ireland, Dept Resp Med, Div Pulm Allergy & Crit Care Med, Dublin, Ireland
[13] Royal Coll Surgeons Ireland, Clin Res Ctr, Beaumont Hosp, Smurfit Bldg, Dublin, Ireland
[14] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[15] Univ Ulsan, ASAN Med Ctr, Dept Allergy & Clin Immunol, Coll Med, Seoul, South Korea
[16] Optimum Patient Care, Cambridge, England
[17] AstraZeneca, Cambridge, England
[18] AstraZeneca, Gaithersburg, MD USA