National Football League
https://www.nfl.com/playerhealthandsafety/resources/fact-sheets/nfl-head-neck-and-spine-committee-s-concussion-diagnosis-and-management-protocol
US Centers for Disease Control and Prevention
https://www.cdc.gov/traumaticbraininjury/
Centers for Disease Control and Prevention - US CDC
https://www.cdc.gov/headsup/resources/playbook.html
Headway Foundation
https://www.youtube.com/watch?v=yJPp7oMvYSQ
US Soccer
https://www.youtube.com/watch?v=ZbiFxxIGt4E
EMPWR Foundation
https://www.youtube.com/watch?v=4Su95q8hUhU
Journal of the American Medical Association (JAMA)
http://jamanetwork.com/journals/jama/fullarticle/2499274
American Broadcasting Corporation
https://www.youtube.com/watch?v=p17cTTHteY4
PBS
https://www.pbs.org/wgbh/frontline/film/league-of-denial/
Journal of the American Medical Association (JAMA)
http://jamanetwork.com/journals/jama/fullarticle/2593568