1. Department of Communication Sciences and Disorders, University of Northern Colorado, Greeley, Colorado, USA.
2. Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, Wisconsin, USA.
3. Department of Medicine-Geriatrics and Gerontology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
4. Departamento de Ciencias de la Rehabilitación en Salud, Facultad de Ciencias de la Salud y de los Alimentos, Universidad del Bio-Bio, Concepción, Chile.
5. Geriatric Research Education and Clinical Center (GRECC) Veterans Administration Hospital, William S. Middleton Memorial Hospital, Madison, Wisconsin, USA.
6. Otolaryngology—Head and Neck Surgery, Department of Surgery, University of Wisconsin, Madison, Wisconsin, USA.