Links
[1] http://montreal.ctv.ca/servlet/an/local/CTVNews/20101113/MTL_concuss_101113/20101113/?hub=MontrealHome
[2] https://www.thechildren.com/trauma/en/treating/injuries/news.aspx?id=404
[3] https://www.thechildren.com/trauma/en/prevention/injuries/news.aspx?id=456