San Francisco 49ers linebacker Chris Borland to retire over concerns about the long-term effects of repetitive head trauma; 'From what I've researched and what I've experienced, I don't think it's worth the risk,' Borland says - @espn

San Francisco 49ers linebacker Chris Borland to retire over concerns about the long-term effects of repetitive head trauma; ‘From what I’ve researched and what I’ve experienced, I don’t think it’s worth the risk,’ Borland says – @espn
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