1. Louisiana State University Medical Center, School of Allied Health Professions, Department of Communication Disorders, Shreveport, Louisiana.
2. Department of Speech Pathology and Audiology, West Virginia University and Department of Otolaryngology—Head and Neck Surgery, West Virginia University School of Medicine, Morgantown, West Virginia.
3. Department of Communicology, University of South Florida, Tampa, Florida.
4. Department of Speech Pathology and Audiology, West Virginia University, Morgan-town, West Virginia.