1. Department of Physical Medicine and Rehabilitation, Harvard Medical School , Boston, Massachusetts 02115 , USA
2. Mass General for Children Sports Concussion Program , Waltham, Massachusetts 02451 , USA
3. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital ; Charlestown, Massachusetts 02129, USA
4. Department of Psychology, University of British Columbia , Vancouver, BC V6T 1Z4 , Canada
5. Department of Computer Science, Colby College , Waterville, Maine 04901 , USA
6. Department of Physical Medicine and Rehabilitation, Massachusetts General Hospital , Boston, Massachusetts 02114 , USA
7. Department of Physical Medicine and Rehabilitation, Brigham and Women's Hospital , Boston, Massachusetts 02115 , USA
8. College of Osteopathic Medicine, University of New England , Biddeford, Maine 04005 , USA
9. Schoen Adams Research Institute at Spaulding Rehabilitation , Charlestown, Massachusetts 02129 , USA