Chris Borland retiring out of concern for head injuries
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San Francisco 49ers Chris Borland Retiring at 24, News
Concussion Concern: LB Retires After One NFL Season
Wary of head trauma, 49ers' Chris Borland retiring at 24
San Francisco 49ers Linebacker Retires at 24 Over Head-Trauma Fears
Chris Borland's Early Retirement Raises Questions About Football's Future - Medill Reports Chicago
Former Badgers star Borland surprisingly announces retirement
An NFL Rookie Leaves the Game, On the Media
For Chris Borland, leaving NFL is not about the money
49ers LB Chris Borland won't be last to retire early for safety reasons - Sports Illustrated
49ers' Chris Borland retires over health concerns – The Mercury News
