1. Department of Phoniatrics, Tampere University Hospital, Tampere, Finland;
2. Speech and Voice Research Laboratory, University of Tampere, Tampere, Finland;
3. Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium;
4. Sint-Augustinus Hospital, European Institute for ORL-HNS, Antwerp, Belgium;
5. Faculty of Education Health & Social Work, University College Ghent, Ghent, Belgium;
6. Department of Speech Language and Hearing Sciences, University of Ghent, Ghent, Belgium;
7. Logopedics, School of Social Sciences and Humanities, University of Tampere, Tampere, Finland