1. Department for Health Evidence, Radboud University Medical Centre , Nijmegen, The Netherlands
2. Audiologisch Centrum, Royal Dutch Kentalis , The Netherlands
3. Department of Research , Pento, Speech and Hearing Centers, The Netherlands
4. Behavioural Science Institute , Radboud University, Nijmegen, The Netherlands
5. Audiologisch Centrum , Royal Dutch Kentalis, The Netherlands
6. Department for Health Evidence , Radboud University Medical Centre, Nijmegen, The Netherlands