1. Department of Health Services University of Washington Seattle Washington USA
2. Department of Environmental and Occupational Health Sciences University of Washington Seattle Washington USA
3. Harborview Injury Prevention and Research Center Seattle Washington USA
4. Institute for Work and Health Toronto Ontario Canada
5. Department of Epidemiology University of Washington Seattle Washington USA
6. Division of Health Services Management and Policy The Ohio State University College of Public Health Columbus Ohio USA
7. Washington State Department of Labor and Industries Tumwater Washington USA
8. Department of Neurology University of Washington Seattle Washington USA