Affiliation: | 1. Department of Environmental and Occupational Health Sciences, University of Washington, , Seattle, Washington, USA;2. Department of Neurology, University of Washington, , Seattle, Washington, USA;3. Department of Family and Preventive Medicine, University of California San Diego, , La Jolla, California, USA;4. Department of Epidemiology, University of Washington, , Seattle, Washington, USA;5. Department of Neurology, Washington University, , St. Louis, Missouri, USA |