1 UPMC Centers for Rehab Services, UPMC Sports Medicine Concussion Program, Pittsburgh, Pennsylvania, USA.
2 Departments of Internal Medicine and Neurology, University of Arizona College of Medicine-Phoenix, Phoenix, Arizona, USA.
3 Departments of Rehabilitation Medicine, Orthopaedics and Sports Medicine and Neurological Surgery, University of Washington, Seattle, Washington, USA.
4 Department of Neurology, University of Colorado School of Medicine, Aurora, Colorado, USA.
5 Department of Health, Human Performance and Recreation, University of Arkansas, Fayetteville, Arkansas, USA.
6 Department of Clinical & Health Psychology, University of Florida Department of Clinical & Health Psychology, Gainesville, Florida, USA.
7 UGA Concussion Research Laboratory, Department of Kinesiology, University of Georgia, Athens, Georgia, USA.
8 Department of Kinesiology, University of Virginia, Charlottesville, Virginia, USA.
9 Department of Psychiatry & Neurobehavioral Sciences, University of Virginia School of Medicine, Charlottesville, Virginia, USA.