1. Stichting Milo, Center for Augmentative and Alternative Communication, 5482 JH Schijndel, The Netherlands
2. Department of Pedagogical Sciences, Radboud University, 6525 XZ Nijmegen, The Netherlands
3. Research Group Relational Care, Knowledge Center Health Innovation, The Hague University of Allied Sciences, 2521 EN The Hague, The Netherlands