1. Department of Respiratory Medicine, Örebro University Hospital, Örebro, Sweden
2. School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
3. Centre for Clinical Research and Education, Region Värmland, Karlstad, Sweden
4. Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
5. Department of Medical Sciences, Occupational and Environmental Medicine, Uppsala University, Uppsala, Sweden
6. Department of Public Health and Caring Sciences, Family Medicine and Preventive Medicine, Uppsala University, Uppsala, Sweden
7. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Faculty of Medicine and Health, Örebro Univeristy, Örebro, Sweden
8. Clinical Epidemiology Division, Department of Medicine, Solna, Sweden
9. Department of Epidemiology and Public Health, University College, London, UK
10. Department of Neurobiology, Care Sciences and Society, Division of Family Medicine and Primary Care, Stockholm, Sweden
11. Academic Primary Health Care Centre, Stockholm, Sweden
12. Department of Respiratory Medicine, Faculty of Medicine and Health, Örebro University, Örebro, Sweden