Brett Favre: Aaron Rodgers vs. Tom Brady showdown rare 'epic matchup'
NFL Concussions: The 2013-14 Season In Review
New concussion protocol revealed by NFL.
Brett Favre considers concussions, calls future 'frightening'
Former NFL Star Brett Farve Opens Up About Concussion Side-Effects
Favre knocked out with head injury; Bears win NFC North - Red Deer Advocate
Brett Favre, Citing CTE, Says Kids Shouldn't Play Tackle Football Until 14 : NPR
The link between head injuries and CTE in football, explained - Vox
NFL legend Brett Favre worryingly claims he had thousands of concussions during career - Mirror Online
Brett Favre has a radical plan for youth tackle football