1. Division of Sports Medicine, Departments of Orthopaedics and Pediatrics, Warren Alpert Medical School, Rhode Island Hospital/Hasbro Children’s Hospital, Brown University, Providence, Rhode Island, USA.
2. Department of Emergency Medicine, Boston Children’s Hospital, Boston, Massachusetts, USA.
3. Department of Neurology, Boston Children’s Hospital, Boston, Massachusetts, USA.
4. Sports Concussion Clinic, Division of Sports Medicine, Department of Orthopedics, Boston Children’s Hospital, Boston, Massachusetts, USA.
5. Micheli Center for Sports Injury Prevention, Waltham, Massachusetts, USA.