1. Center for Health Outcomes and Interdisciplinary Research (CHOIR), Department of Psychiatry, Massachusetts General Hospital, Boston, MA 02114, USA
2. Harvard Medical School, Boston, MA 02115, USA
3. Dr. Robert Cantu Concussion Center, Emerson Hospital, Concord, MA 01742, USA
4. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital and The Schoen Adams Research Institute at Spaulding Rehabilitation, Charlestown, MA 02129, USA
5. MassGeneral Hospital for Children Sports Concussion Program, Boston, MA 02114, USA
6. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02115, USA
7. Department of Psychology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
8. Rehabilitation Research Program, Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 1M9, Canada
9. Biostatistics Center, Massachusetts General Hospital, Boston, MA 02114, USA
10. Spaulding Rehabilitation Hospital, Charlestown, MA 02129, USA
11. Department of Psychiatry, Massachusetts General Hospital, Boston, MA 02114, USA
12. Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA