1. Department of Kinesiology, Coastal Carolina University, Conway, South Carolina, USA
2. Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
3. UPMC Sports Medicine Concussion Program, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
4. Michigan Concussion Center, University of Michigan, Ann Arbor, Michigan, USA
5. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
6. Department of Psychiatry, Indiana University School of Medicine, Indianapolis, Indiana, USA