1. Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
2. Leonard D. Schaeffer Center for Health Policy & Economics, University of Southern California, Los Angeles
3. School of Pharmacy, University of Southern California, Los Angeles
4. Department of Neurological Surgery, University of Washington, Seattle
5. Department of Biostatistics, University of Washington, Seattle
6. Department of Neurological Surgery, University of California, San Francisco
7. Zuckerberg San Francisco General Hospital, San Francisco, California
8. for the TRACK-TBI Investigators