Chris Borland retires from NFL aged 24
Teenage Sports Blog – I say the things you won't
49ers linebacker Chris Borland retiring at 24 due to long-term
49ers among biggest hit by early retirements of Borland, Anthony
node:title] San Francisco 49ers Rookie Chris Borland Retires at 24
Chris Borland retires from 49ers after one year due to fears over
Hard Truth On Wisconsin Magazine
49ers' Borland retires after rookie year over head trauma fears
Health fears lead young San Francisco 49ers linebacker Chris
NFL uses Chris Borland retirement as opportunity to tout football