NFL Rookie Chris Borland Explains His Decision To Retire

March 19, 2015 2:43 PM

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“I don’t think even the top neurologists truly understand the risks and the connections [between football and brain trauma],” he said during an interview with "CBS This Morning." "There’s just too much unknown for me, and there have been too many tragedies for me to be comfortable playing."

Borland, 24, said there’s one big difference between football and riding a bike.

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