1. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts.
2. MassGeneral Hospital for Children Sport Concussion Program, Boston, Massachusetts.
3. Red Sox Foundation and Massachusetts General Hospital Home Base Program, Boston, Massachusetts.
4. Spaulding Rehabilitation Hospital, Charlestown, Massachusetts.
5. Department of Psychology, Colby College, Waterville, Maine.
6. Health Services and Department of Biology, Colby College, Waterville, Maine.