1. Micheli Center for Sports Injury Prevention, Waltham, Massachusetts.
2. Brain Injury Center, Boston Children's Hospital, Boston, Massachusetts.
3. Sports Concussion Clinic, Boston Children's Hospital, Boston, Massachusetts.
4. Division of Emergency Medicine, Boston Children's Hospital, Boston, Massachusetts.
5. Department of Neurology, Boston Children's Hospital, Boston, Massachusetts.
6. Health Services, Colby College, Waterville, Maine.
7. Department of Psychology, Williams College, Williamstown, Massachusetts.
8. Middlebury College, Middlebury, Vermont.
9. Department of Psychology, Wesleyan University, Middletown, Connecticut.
10. Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts.