1. Department of Clinical Science, Intervention and Technology, Unit of Audiology, Karolinska Institutet, Stockholm, Sweden,
2. Department of Audiology and Neurotology, Karolinska University Hospital, Huddinge, Sweden,
3. Department of Monitoring and Evaluation, Public Health Agency of Sweden, Stockholm, Sweden,
4. Department of Occupational Medicine, Karolinska Institutet, Stockholm, Sweden, and
5. Department of Medical Sciences, Uppsala University, Uppsala, Sweden