1. Division of Medicine, Ryhov Hospital, Jönköping, Sweden
2. Department of Medical and Health Sciences (IMH), Linköping University, Linköping, Sweden
3. Department of Occupational and Environmental Medicine, Department of Clinical and Experimental Medicine (IKE), Linköping University, Linköping, Sweden
4. Department of Respiratory Medicine, Department of Medical and Health Sciences (IMH), Linköping University, Linköping, Sweden