1. Department of Neurology, School of Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road L226, Portland, OR 97239, USA
2. Multiple Sclerosis Center of Excellence-West, Portland Department of Veterans Affairs Medical Center, Portland, OR 97239, USA
3. Portland Lung Clinic, Adventist Medical Center, Portland, OR 97216, USA
4. Department of Medical Informatics and Clinical Epidemiology, School of Medicine, Oregon Health & Science University, Portland, OR 97239, USA
5. Epilepsy Center of Excellence, Portland Veterans Affairs Medical Center, Portland, OR 97239, USA
6. Department of Neurology, School of Medicine, Louisiana State University Health Sciences Center-New Orleans, New Orleans, LA 70112, USA
7. National Center for Rehabilitative Auditory Research, Portland Veterans Affairs Medical Center, Portland, OR 97239, USA
8. Department of Rehabilitation Medicine, University of Washington, VA Puget Sound Health Care System, VA MS Center of Excellence-West, Seattle, WA 98108, USA
9. Department of Epidemiology, University of Washington, VA Puget Sound Health Care System, VA MS Center of Excellence-West, Seattle, WA 98108, USA