1. Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
2. Department of Pharmacology and Neuroscience, Texas Tech University Health Sciences Center, Lubbock, TX, USA
3. Department of Neurology, Texas Tech University Health Sciences Center, Lubbock, TX, USA
4. Departments of Speech, Language and Hearing Sciences, Texas Tech University Health Sciences Center, Lubbock, TX, USA
5. Garrison Institute on Aging, South West Campus, Texas Tech University Health Sciences Center, Lubbock, TX, USA