1. Department of Neurosurgery, Medical College of Wisconsin , Wauwatosa, WI 53226 , United States
2. Department of Exercise and Sport Science, University of North Carolina at Chapel Hill , Chapel Hill, NC 27559 , United States
3. Datalys Center for Sports Injury Research and Prevention , Indianapolis, IN 46220 , United States
4. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University School of Medicine , Richmond, VA 23284 , United States
5. Boston Children’s Hospital , Boston, MA 02115 , United States
6. Department of Pediatrics and Emergency Medicine, Harvard Medical School , Boston, MA 02115 , United States
7. Michigan Concussion Center , School of Kinesiology, , Ann Arbor, MI 48109 , United States
8. University of Michigan , School of Kinesiology, , Ann Arbor, MI 48109 , United States
9. Psychological and Neurobehavioral Associates, Inc., State College , PA 16801 , United States
10. Department of Pediatrics and Orthopedics, Harvard Medical School , Boston, MA 02115 , United States