Affiliation: | aDepartment of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Göteborg, Sweden bDepartment of Occupational and Environmental Medicine, Sahlgrenska University Hospital, Göteborg, Sweden cDepartment of Public Health, Västra Götalandsregionen, Sweden dDepartment of Pediatrics, Sahlgrenska University Hospital, Göteborg, Sweden |