1Center for the Study of Traumatic Encephalopathy, Department of Neurology, Boston University School of Medicine, 72 East Concord Street, B7800, Boston, MA 02118, USA
2Sports Legacy Institute, Waltham, MA, USA
3Department of Neuropathology, Bedford Veterans Affairs Medical Center, 200 Springs Road, 182-B, Bedford, MA 01730, USA
4Departments of Neurology and Pathology, Boston University School of Medicine, Boston, MA, USA
5Department of Neurosurgery, Boston University School of Medicine, Boston, MA, USA
6Department of Neurosurgery, Emerson Hospital, John Cuming Building, Suite 820, 131 ORNAC, Concord, MA 01742, USA
7Department of Surgery, Emerson Hospital, John Cuming Building, Suite 820, 131 ORNAC, Concord, MA 01742, USA
8Neurologic Sports Injury Center, Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA, USA