1. Faculty of Medicine, University of Helsinki, Helsinki, Finland
2. Finnish Lung Health Association, Helsinki, Finland
3. Department of Pulmonology, Helsinki University Central Hospital, Helsinki, Finland
4. Skin and Allergy Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
5. Finnish Institute for Health and Welfare, Helsinki, Finland
6. The Organization for Respiratory Health in Finland, Helsinki, Finland
7. Inflammation Center, Helsinki University Central Hospital, Helsinki, Finland
8. Faculty of Medicine, Department of Pulmonary Diseases and Clinical Allergology, University of Turku, Turku, Finland