Chris Borland Retires at Age 24 Over Concussions
Vontae Davis of Buffalo Bills Retires During an N.F.L. Game - The New York Times
Andy Baggot: Chris Borland was great on the field, will be even better off it
49ers ex-linebacker Chris Borland salutes Pat Tillman
San Francisco 49ers Chris Borland retires over repeated head trauma
First-game flaws too familiar for 49ers
Chris Borland's Early NFL Exit Doesn't Mean Avoiding Brain Damage, Experts Say - ABC News
I AM IN PAIN HEAD TO TOE - PressReader
Athlete to Educator: Chris Borland wants to talk
Chris Borland's NFL Retirement Cost Him Millions, But Could Add 2 Decades To His Life, Statistics Show