1. Observational and Pragmatic Research Institute, Pte., Ltd., Singapore, Singapore.
2. Academic Primary Care, University of Aberdeen, Aberdeen, United Kingdom.
3. Inhalation Consultancy, Ltd., Leeds, United Kingdom.
4. Department of Medicine, National Jewish Health and University of Colorado Denver, Denver, Colorado.
5. Pulmonary and Critical Care Division, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts.
6. Department of Pediatric Respiratory Medicine and Allergy, Emma Children's Hospital AMC, Amsterdam, The Netherlands.
7. Department of Medical Sciences, University of Ferrara, Ferrara, Italy.
8. Airway Disease Section, National Heart and Lung Institute, Imperial College London, and Royal Brompton Hospital, London, United Kingdom.
9. University Paris Descartes (EA2511), Cochin Hospital Group (AP-HP), Paris, France.