title: Response to John Hancock.
authors.forename: M G
authors.initials: MG
authors.lastname: Perkinson
mesh_terms: D000329:Advertising; D003143:Communication Devices for People with Disabilities; D005260:Female; D006801:Humans; D008297:Male; D013066:Speech-Language Pathology / Q000191:economics; D013342:Stuttering / Q000534:rehabilitation; D013690:Television