Chris Borland's early retirement shifts focus of head injuries in
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NFL players react to Chris Borland's surprise retirement - Sports
NFL rookie Chris Borland on retiring over concussion concerns
Chris Borland retires from NFL at just 24 years old, makes his own
Fearing brain injury, 49ers' Chris Borland retires after one year
Chris Borland's Concussion Concerns, Retirement Are Latest Big
NFL players react to Chris Borland's surprise retirement - Sports
Borland Retiring : r/49ers
Andy Baggot: Chris Borland was great on the field, will be even
Borland Retiring : r/49ers