1. School of Communication Sciences and Disorders, Western University, London, Ontario, Canada; Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, Ontario, Canada
2. Audiology and Speech Pathology, The University of Tennessee Health Science Centre, Knoxville, Tennessee, USA
3. Department of Philosophy, York University, Toronto, Ontario, Canada
4. Communication Sciences and Disorders, Western University, London, Ontario, Canada