1. College of Education and Human Development Communication Sciences & Disorders, Georgia State University, Atlanta, GA, USA
2. Communication Disorders, University of Nebraska-Kearney, Kearney, NE, USA
3. Educational & Counseling Psychology and Special Education, University of British Columbia, Vancouver, Canada
4. Pennsylvania State University, Communication Sciences and Disorders, University Park, PA, USA
5. The Bridge School, Augmentative Communication Inc., Monterey, CA, USA
6. Institute for Rehabilitation Science and Engineering, Madonna Rehabilitation Hospital, Lincoln, NE, USA
7. Department of Communication Sciences and Disorders, University of Wisconsin-Stevens Point, Stevens Point, WI, USA
8. Duquesne-China Health Institute, Pittsburgh, PA, USA
9. Assistive Technology Law Center, USSAAC, Ithaca, NY, USA
10. Communication Sciences and Disorders, University of Houston, Houston, TX, USA
11. Department of Special Education and Communication Disorders, University of Nebraska-Lincoln, Lincoln, NE, USA
12. Augmentative Communication Inc, Sacramento, CA, USA
13. Division of Speech Pathology, Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA