| Affiliation: | 1. Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health and Community Medicine, Seattle, Washington;2. Department of Health Services, University of Washington School of Public Health and Community Medicine, Seattle, Washington;3. Department of Neurology, University of Washington School of Medicine, Seattle, Washington;4. Division of Health Services Management and Policy, College of Public Health, Ohio State University, Columbus, Ohio |
