1. Department of Environmental and Occupational Health Sciences, Neurology, and Health Services; University of Washington, School of Public Health and Community Medicine; Seattle; WA
2. Washington State Department of Labor & Industries; Seattle; WA
3. Medicine, and Community & Family Medicine; The Geisel School of Medicine at Dartmouth; Hanover; NH
4. Community and Family Medicine; Dartmouth-Hitchcock Medical Center; Lebanon; NH
5. Family Medicine, Medicine, and Public Health and Preventive Medicine; Kaiser Center for Health Research, Oregon Health & Science University; Portland; OR