1. Department of Special Needs Education, University of Oslo, Oslo, Norway
2. Department of Special Education, Catholic University of Korea, South Korea
3. Department of Education, Sungshin Women’s University, Seoul, South Korea
4. Department of Otorhinolaryngology and Head and Neck Surgery, Leiden University Medical Centre, Leiden, The Netherlands
5. Curtin School of Allied Health, Curtin University, Perth, Australia