1. Center for Population Health Research School of Public and Community Health Sciences University of Montana Missoula Montana USA
2. Departments of Family Medicine and Global Health University of Washington Seattle Washington USA
3. Department of Epidemiology School of Public Health University of Washington Seattle Washington USA
4. Department of Neurology and McKnight Brain Institute University of Florida Gainesville Florida USA
5. Department of Neurology University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
6. Departments of Environmental and Occupational Health Sciences and Medicine School of Public Health University of Washington Seattle Washington USA