1. Koninklijke Kentalis, Den Bosch and Sint Michielsgestel, the Netherlands,
2. Adelante Audiology and Communication, Hoensbroek, the Netherlands,
3. ENT Department, Maastricht University Medical Center, School for Mental Health & Neuroscience, Maastricht, the Netherlands, and
4. Department of Health, Ethics and Society, Maastricht University, Maastricht, the Netherlands