1. Department of Otorhinolaryngology and Phoniatrics - Head and Neck Surgery, Helsinki University Hospital, Finland
2. Doctoral School in Health Sciences, University of Helsinki, Finland
3. Department of Logopedics, School of Humanities, Philosophical Faculty, University of Eastern Finland, Joensuu
4. Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Finland
5. Research Unit of Logopedics, University of Oulu, Finland
6. Department of Psychology/Welfare Sciences, Faculty of Social Sciences, Tampere University, Finland