1. Faculty of Behavioral and Social Sciences, Department of Special Needs Education and Youth Care, University of Groningen, Groningen, the Netherlands
2. Faculty of Behavioral and Social Sciences, Department of Sociology, University of Groningen, Groningen, the Netherlands
3. School of Education, Stenden University of Applied Sciences, Leeuwarden, the Netherlands
4. Otolaryngology Department, University Medical Center Groningen, Groningen, the Netherlands