1. Royal Kentalis, Kentalis Academy, Utrecht, The Netherlands
2. Behavioural Science Institute, Radboud University, Nijmegen, The Netherlands
3. Specialized Education Services, University of North Carolina Greensboro, Greensboro, NC, USA
4. LDES, Kent State University, Kent, OH, USA
5. Dutch Foundation for the Deaf and Hard of Hearing Child (NSDSK), Amsterdam, The Netherlands
6. Department of Psychology, Utrecht University, Utrecht, The Netherlands