President Barack Obama shakes hands with former football player Lavar Arrington, left, as former professional soccer player and current ESPN analyst Taylor Twellman watches at center, after Obama spoke at the White House Healthy Kids & Safe Sports Concussion Summit, Thursday, May 29, 2014, in the East Room of the White House in Washington. Obama was hosting the summit with representatives of professional sports leagues, coaches, parents, young athletes, researchers and others to call attention to the issue of youth sports concussions. (AP Photo/Susan Walsh)
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