Concussions in American football - Wikipedia
CQ Researcher - Sports Safety
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The N.F.L.'s Tragic C.T.E. Roll Call - The New York Times
NFL great Seau dies in apparent suicide
Duerson's kin donating his brain for research - The San Diego
Did head injuries lead to Dave Duerson's suicide?
Paul Oliver: commits suicides - Gistmania
Did head injuries lead to Dave Duerson's suicide?
Duerson's kin donating his brain for research - The San Diego
Dave Duerson's Suicide Raises Awareness of Brain Injuries