1. Vanderbilt Sports Concussion Center, Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
2. Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
3. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusettss, USA.
4. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital and the Schoen Adams Research Institute at Spaulding Rehabilitation, Charlestown, Massachusetts, USA.
5. Mass General for Children Sports Concussion Program, Waltham, Massachusetts, USA.
6. Home Base, A Red Sox Foundation and Massachusetts General Hospital Program, Charlestown, Massachusetts, USA.