1. School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Region Västra Götaland, Habilitation & Health, Hearing Organization, Gothenburg, Sweden
3. Occupational and Environmental Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden
4. School of Health and Medical Sciences, Örebro University, Örebro, Sweden