Michigan Concussion Center, University of Michigan, Ann Arbor, MI, USA. llempke@umich.edu.

Exercise and Sport Science Initiative, University of Michigan, Ann Arbor, MI, USA. llempke@umich.edu.

, 830 North University Avenue, Suite 4000, Ann Arbor, MI, 48109, USA. llempke@umich.edu.

Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.

Uniformed Services University of the Health Sciences, Bethesda, MD, USA.

Michigan Concussion Center, University of Michigan, Ann Arbor, MI, USA.

School of Health and Rehabilitation Sciences, The Ohio State University, Columbus, OH, USA.

Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA.

Keller Army Hospital and United States Military Academy, West Point, NY, USA.

Division of Adolescent Medicine, University of Washington, Seattle, WA, USA.

Department of Behavioral Science and Leadership, United States Air Force Academy, USAF Academy, El Paso County, CO, USA.

Department of Physical Medicine & Rehabilitation, University of Michigan, Ann Arbor, MI, USA.

Department of Rehabilitation and Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Department of Health Sciences and Kinesiology, Georgia Southern University, Statesboro, GA, USA.

Department of Rehabilitation and Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Department of Exercise Science, California Lutheran University, Thousand Oaks, CA, USA.

Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM, USA.

Center for Injury Research and Prevention, Children’s Hospital of Philadelphia, Philadelphia, PA, USA.

Major League Soccer, Princeton, NJ, USA.

Department of Orthopedics and Sports Medicine, United States Naval Academy, Annapolis, MD, USA.

Uniformed Services University of the Health Sciences, Bethesda, MD, USA.

Center for Neurotrauma Research, Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, USA.

Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA.

Michigan Concussion Center, University of Michigan, Ann Arbor, MI, USA.

Center for Injury Research and Prevention, Children’s Hospital of Philadelphia, Philadelphia, PA, USA.

Orthopaedics and Sports Medicine, Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, PA, USA.