British Journal of Sports Medicine
https://bjsm.bmj.com/node/107137.full
British Journal of Sports Medicine
https://bjsm.bmj.com/content/50/5/292?utm_term=1-B&utm_content=americas&utm_campaign=alljjs&utm_medium=cpc&utm_source=trendmd
Canadian Journal of Neurological Sciences
https://www.cambridge.org/core/journals/canadian-journal-of-neurological-sciences/article/experience-with-canadas-first-policy-on-concussion-education-and-management-in-schools/9B02EA978FB8BAD49D8BCD2DE11AA786
Journal of the American Medical Association (JAMA)
http://jamanetwork.com/journals/jama/fullarticle/2499274
Canadian Family Physician
http://www.cfp.ca/content/60/6/505.short
British Journal of Sports Medicine
https://bjsm.bmj.com/content/49/2/88.short
Journal of the American Medical Association (JAMA)
http://jamanetwork.com/journals/jama/fullarticle/2593568