1. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Spaulding Rehabilitation Hospital, MassGeneral Hospital for Children™ Sports Concussion Program, and Home Base, A Red Sox Foundation and Massachusetts General Hospital Program, Boston, MA, USA
2. Department of Pathology, Division of Neuropathology, University of Washington School of Medicine, Seattle, WA, USA
3. College of Sciences, University of Texas, San Antonio, San Antonio, TX, USA
4. Center for Neuropathology, Western Michigan University Homer Stryker MD School of Medicine, Kalamazoo, MI, USA