1. Department of Orthopedic Surgery, UPMC Sports Medicine Concussion Program, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
2. School of Optometry, Indiana University-Bloomington, Bloomington, Indiana, USA
3. Department of Physical Therapy, Duquesne University, Pittsburgh, Pennsylvania, USA
4. Department of Community Health and Family Medicine, University of Florida, Gainesville, Florida, USA
5. Department of Kinesiology and Recreation Administration, Humboldt State University, Arcata, USA
6. School of Kinesiology, Michigan Concussion Center, University of Michigan, Ann Arbor, Michigan, USA
7. Department of Psychiatry, Indiana University School of Medicine, Indianapolis, India
8. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
9. Center for Rehabilitation Sciences Research, Uniformed Services University of the Health Sciences; Walter Reed National Military Medical Center, Bethesda, Maryland, USA