1. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Charlestown, Massachusetts, USA.
2. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA.
3. Department of Physical Medicine and Rehabilitation, Schoen Adams Research Institute at Spaulding Rehabilitation, Charlestown, Massachusetts, USA.
4. Sports Concussion Program, Mass General for Children, Boston, Massachusetts, USA.
5. Home Base, A Red Sox Foundation and Massachusetts General Hospital Program, Charlestown, Massachusetts, USA.
6. Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Camperdown, New South Wales, Australia.
7. Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.