1. Faculty of Medicine and Health Sciences; University of Antwerp
2. Institute of Health Studies; HAN University of Applied Sciences; Nijmegen The Netherlands
3. Department of Otolaryngology of the Lithuanian University of Health Sciences; Kaunas Lithuania
4. European Institute for ORL, Sint-Augustinus Hospital; Antwerp
5. Department of Speech, Language and Hearing Sciences; Ghent University
6. Faculty of Education, Health and Social Work; University College Ghent; Ghent Belgium