Ravens Lineman Retires to Pursue MIT Doctorate after CTE Study Released
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Sullivan: Brain damage remains football's greatest foe
Could Football Ever End? - WSJ
Football's moment of truth
John Urschel, Ravens lineman, retiring from football at 26
For John Urschel, math was his passion—and concussions a concern
CTE Brain Research Will Determine U.S. Football's Fate - Bloomberg
For Ravens' John Urschel, Playing in the N.F.L. No Longer Adds Up
Blog Archives - DozOnLife
Concerned with long-term damage from head injuries, Ravens
Rob Gronkowski apparently is an extremely frugal person and is
/cdn.vox-cdn.com/uploads/chorus_image/image/55876967/243301.0.jpg "CTE found in 99 percent of former NFL players' brains donated in new study")
