1. Department of Clinical Science; Intervention and Technology; Division of Ear, Nose and Throat Diseases, Karolinska Institutet; Stockholm Sweden
2. Department of ENT diseases; Karolinska University Hospital; Stockholm Sweden
3. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
4. Department of Education and Clinical Science; Södersjukhuset; Karolinska Institutet; Stockholm Sweden
5. Sachs’ Children's Hospital; Södersjukhuset; Stockholm Sweden
6. Centre for Occupational and Environmental Medicine; Stockholm County Council; Stockholm Sweden
7. Department of Otolaryngology-Head and Neck Surgery; Temple University; Philadelphia PA USA