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Bill Polian on Chris Borland retirement: 'Football has a lot of danger in it ... just as the military does' - nj.com
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49ers linebacker Chris Borland retires at 24 due to head trauma concerns | LAist - NPR News for Southern California - 89.3 FM
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San Francisco 49ers' Chris Borland reveals a concussion during camp made him walk away | Daily Mail Online
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