1. National Heart and Lung Institute, London, United Kingdom;
2. Medical Research Council and Asthma UK Centre in Allergic Mechanisms of Asthma, London, United Kingdom;
3. Guy’s Severe Asthma Centre, Guy’s and St. Thomas’ National Health Service Trust, London, United Kingdom;
4. St. Mary’s Flow Cytometry Core Facility, London, United Kingdom;
5. School of Immunology and Microbial Sciences, King’s College London, London, United Kingdom; and
6. National Institute for Health Research Respiratory Biomedical Research Unit, Department of Infection, Immunity & Inflammation, Leicester Institute for Lung Health, University of Leicester, Leicester, United Kingdom