1. Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden;
2. Center for Research & Development, Uppsala University/Region Gävleborg, Gävle, Sweden;
3. Department of Public Health and Caring Sciences, Family Medicine and Preventive Medicine, Uppsala University, Uppsala, Sweden;
4. Center for Clinical Research, Uppsala University, County Council Dalarna, Falun, Sweden;
5. Department of Medical Sciences, Clinical Physiology, Uppsala University, Uppsala, Sweden