1. Department of Medicine, University of Wisconsin-Madison School of Medicine and Public Health
2. Department of Surgery, University of Wisconsin-Madison School of Medicine and Public Health
3. Geriatric Research Education and Clinical Center, William S. Middleton Memorial Veterans Hospital, Madison, WI
4. Department of Speech, Language and Hearing Sciences, University of Florida, Gainesville
5. Aerodigestive Research Core, University of Florida, Gainesville
6. Department of Neurology, College of Medicine, University of Florida, Gainesville