An investigation by The New York Times has found the National Football League's concussion research to be much more flawed than previously known.
Confidential data obtained by The Times shows that more than 100 diagnosed concussions were omitted from the NFL's studies -- including some severe injuries to stars like former Cowboys quarterback Troy Aikman.
From The Times' report, written by Alan Schwarz, Walt Bogdanich and Jacqueline Williams:
"The database does not include any concussions involving the Dallas Cowboys for all six seasons, including four to Mr.