1. The Obstructive Lung Disease in Northern Sweden Unit, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine, Umeå University, Umeå, Sweden
2. Division of Nursing, Department of Health Sciences, Luleå University of Technology, Luleå, Sweden
3. Division of Respiratory Medicine, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
4. Karolinska Institutet, Division of Cardiovascular Medicine, Department of Clinical Sciences, Danderyd University Hospital, Stockholm, Sweden
5. The Obstructive Lung Disease in Northern Sweden Unit, Division of Medicine, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
6. Krefting Research Center, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden