1Sports Concussion Research Group, Department of Kinesiology, Texas Christian University, Fort Worth, Texas.
2Division of Health and Human Performance, George Mason University, Manassas, Virginia.
3Department of Sport Medicine, John Peter Smith Hospital, Fort Worth, Texas.
4Department of Sport Medicine, Texas Christian University, Fort Worth, Texas.
5Clinical Neurochemistry Laboratory, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at University of Gothenburg, Mölndal, Sweden
6UmanDiagnostics, Umeå, Sweden
7Department of Molecular Neuroscience, University College London Institute of Neurology, Queen Square, London, United Kingdom.
