Concussion has become a major concern in American football and ice hockey, as star players are sidelined and former players increasingly speak out about the long-term health effects of head injuries.
Junior Seau warms up before a game against the Indianapolis Colts on November 15, 2009. The New England Patriots star, considered one of the greatest linebackers of all time, shot himself last May and died at the age of 43.
Dozens of federal lawsuits by more than 3,700 former National Football League (NFL) players, including a class action on behalf of over 2,000 ex-players, accuse bosses of ignoring evidence about the long-term impact of repeated blows to the head.
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