1. Departments of Exercise and Sport Science and Orthopedics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
2. Department of Neurosurgery, West Virginia University, School of Medicine, Morgantown, West Virginia
3. Neuroscience Center, Waukesha Memorial Hospital, Waukesha, Wisconsin, and Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin
4. Neurosurgery Service, Emerson Hospital, Concord, Massachusetts, and Neurological Sports Injury Center, Brigham and Women's Hospital, Boston, Massachusetts
5. Chicago Neurological Institute, Chicago, Illinois, and Department of Neurology, Loyola University Medical School, Maywood, Illinois
6. Memory Evaluation and Treatment Service, Burke Rehabilitation Hospital, White Plains, New York