1. Department of Otolaryngology - Head and Neck Surgery, The University of Iowa, Iowa City, Iowa
2. Department of Communication Sciences and Disorders, The University of Iowa, Iowa City, Iowa
3. Speech-Language and Hearing Clinic, University at Buffalo, Buffalo, New York
4. Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil