Chris Borland Announces NFL Retirement From San Francisco 49ers
49ers LB Chris Borland is retiring after one season rather than
49ers' Chris Borland retiring at 24, wary of head trauma
Concussion Concern: LB Retires After One NFL Season
Rookie NFL linebacker Chris Borland retires at age 24 for fear of
Two Stories, One Reason: Why An Actor And An Athlete Refuse To
Chris Borland, Fearing for Health, Retires From the 49ers. At 24
Chris Borland retires: Concussion crisis deepens as worried former
San Francisco 49ers Linebacker Retires at 24 Over Head-Trauma Fears
San Francisco 49ers: Who Will Replace Patrick Willis and Chris
Is Chris Borland an outlier or the start of a trend? With
UW football: Borland critical of Badgers, football in new documentary
Chris Borland talks 'early' retirement in UW-Madison guest lecture
Is Chris Borland's retirement the beginning of the end for the NFL
Chris Borland retires from 49ers after one year due to fears over