Concussions: The Crosby Effect

http://www.nydailynews.com/sports/hockey/doctors-findings-explain-slow-comebacks-concussions-nhl-players-article-1.976862?localLinksEnabled=false

http://en.wikipedia.org/wiki/Christopher_Nowinski

http://www.google.ca/#hl=en&sa=X&ei=hNHAToTgK6Pz0gG7rpynBQ&ved=0CCAQvwUoAQ&q=dr+robert+cantu&spell=1&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=fe269bd003e48d6&biw=1280&bih=709