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