1. Department of Radiology, University of Washington, Seattle2Department of Neurological Surgery, University of Washington, Seattle3Department of Health Services, University of Washington, Seattle4Comparative Effectiveness, Cost and Outcomes Research Center,
2. Department of Radiology, University of Washington, Seattle4Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle11Department of Pharmacy, University of Washington, Seattle
3. Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle5Department of Biostatistics, University of Washington, Seattle
4. Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle7Department of Rehabilitation Medicine, University of Washington, Seattle
5. Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle6Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle
6. Division of Research, Northern California Kaiser to Permanente, Oakland
7. Department of Radiology, University of Washington, Seattle4Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle
8. Department of Radiology, University of Washington, Seattle
9. Department of Health Services, University of Washington, Seattle
10. Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Spine Unit, Harvard Vanguard Medical Associates, Boston, Massacusetts
11. Neuroscience Institute, Henry Ford Hospital, Detroit, Michigan
12. Department of Biostatistics, University of Washington, Seattle
13. Department of Pharmacy, University of Washington, Seattle
14. Rehabilitation Medicine Department, Mark O. Hatfield Clinical Research Center, National Institutes of Health, Bethesda, Maryland
15. Department of Neurosurgery and the Center for Health Policy and Health Services Research, Henry Ford Health System, Detroit, Michigan
16. Department of Family Medicine, Internal Medicine, and Public Health and Preventive Medicine, and the Oregon Institute for Occupational Health Sciences, Oregon Health and Science University, Portland