1. Puddingstone Place, LLC, Wellesley, MA, USA
2. Center for Communication Enhancement, Boston Children’s Hospital, Waltham, MA, USA
3. Department of Otolaryngology, Harvard Medical School, Boston, MA, USA
4. Department of Communication Sciences and Disorders, Northeastern University, Boston, MA, USA
5. Centre for Augmentative and Alternative Communication, Faculty of Humanities, University of Pretoria, Pretoria, South Africa
6. Department of Communication Sciences & Disorders, MGH Institute of Health Professions, Boston, MA, USA