Improper Helmet Fit Tied to Concussion Severity in High School
Study: Newer Football Helmets Could Slash Concussion Risks
Football Concussions: Prevention, Diagnosis & Recovery
Concussions from top-of-head impact 'more severe'
Football helmet with liquid padding may prevent concussions
More padding the issue of concussions and better helmets
Guardian Caps Guardian Sports
NFL players don Guardian Caps, designed to protect from concussion
NFL Helmet Manufacturer Warned On Concussion Risk
The Longevity Project: Traumatic brain injury and concussion
Next gen hard hats give better protection against head injury
Guardian Cap: What are and why the NFL asks this safety measure in
Can Custom-Fit Football Helmets Protect Athletes From Brain Trauma
Helmet tests proposed in concussion fight