1. School of Health and Welfare, Swedish Institute for Disability Research, Jönköping University, Jonkoping, Sweden;
2. Centre for Research and Development, Uppsala University/Region Gävleborg, Gävle, Sweden;
3. Centre for Augmentative and Alternative Communication, University of Pretoria, Pretoria, South Africa;
4. Centre for Disability and Development Research, Australian Catholic University, Melbourne, Australia;
5. School of Occupational Therapy, Speech pathology and Social Work, Curtin University, Perth, Australia