1. Hearing and Balance Research Program, James H. Quillen VA Medical Center, Mountain Home, TN, USA
2. Physical Therapy Program, College of Clinical and Rehabilitative Health Sciences, East Tennessee State University, Johnson City, TN, USA
3. Independent Research Scholar, Palo Alto, CA, USA
4. Rehabilitation Research & Development Center, Atlanta VA Medical Center, Decatur, GA, USA
5. The Eye Clinic, Atlanta VA Medical Center, Decatur, GA, USA