1. University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
2. University of Michigan, Ann Arbor, MI, USA
3. Medical College of Wisconsin, Milwaukee, WI, USA
4. Datalys Center for Sports Injury Research and Prevention, Inc., Indianapolis, IN, USA
5. Boston Children’s Hospital, Boston, MA, USA
6. University of Missouri—Kansas City, Kansas City, MO, USA
7. University Orthopedics Center Concussion Clinic, State College, PA, USA