1. Department of Neurology, Medical College of Wisconsin, Milwaukee, WI, USA
2. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, USA
3. Department of Anatomy and Neurobiology, Boston University Medical Center, Boston, MA, USA
4. Vanderbilt Sports Concussion Center, Vanderbilt University Medical Center, Nashville, TN, USA
5. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN, USA