[1] Royal Brompton & Harefield NHS Fdn Trust, UK Severe Asthma Network & Natl Registry, London, England
[2] AstraZeneca, Gaithersburg, MD USA
[3] Optimum Patient Care, Cambridge, England
[4] Alfred Hlth, Allergy Asthma & Clin Immunol Serv, Melbourne, Vic, Australia
[5] Univ Queensland, Diamantina Inst & PA Southside Clin Unit, Brisbane, Qld, Australia
[6] Queens Univ Belfast, UK Severe Asthma Network & Natl Registry, Belfast, Antrim, North Ireland
[7] Hvidovre Univ Hosp, Dept Resp Med, Hvidovre, Denmark
[8] Hosp Med Sur, Directora Ctr Excelencia Asma & Alergia, Mexico City, DF, Mexico
[9] Univ Groningen, Univ Med Ctr Groningen, Groningen Res Inst Asthma & COPD GRIAC, Dept Gen Practice, Groningen, Netherlands
[10] Inst Heart Lung Hlth, Vancouver, BC, Canada
[11] Natl Jewish Hlth, Dept Med, Div Allergy & Clin Immunol, Denver, CO USA
[12] Univ Colorado Hosp, Dept Internal Med, Div Allergy & Clin Immunol, Denver, CO USA
[13] Kuwait Univ, Fac Med, Microbiol Dept, Al Rashed Allergy Ctr,Minist Hlth, Kuwait, Kuwait
[14] Son Espases Univ Hosp IdISBa Ciberes, Mallorca, Spain
[15] Guys & St Thomas NHS Trust, Guys Severe Asthma Ctr, London, England
[16] Hosp Univ Lucus Augusti, Dept Resp Med, Lugo, Spain
[17] Bispebjerg Hosp, Resp Res Unit, Copenhagen, Denmark
[18] Bispebjerg & Frederiksberg Hosp, Dept Resp Med, Copenhagen, Denmark
[19] Univ Hosp Aarhus, Aarhus, Denmark
[20] Natl & Kapodistrian Univ Athens, Med Sch, Attikon Univ Hosp, Resp Med Dept 2, Athens, Greece
[21] Univ Michigan, Dept Med, Ann Arbor, MI 48109 USA
[22] Observat & Pragmat Res Inst, Singapore, Singapore
[23] Univ Aberdeen, Div Appl Hlth Sci, Ctr Acad Primary Care, Aberdeen, Scotland