1. Department of Otorhinolaryngology/Head & Neck Surgery; University of Groningen; University Medical Center Groningen; Groningen the Netherlands
2. DQI group; Department of Industrial Design; Eindhoven University of Technology; Eindhoven the Netherlands
3. Department of Biomedical Engineering; University of Groningen; University Medical Center Groningen; Groningen the Netherlands
4. Faculty of Engineering Technology; University of Twente; Enschede the Netherlands