FILE - In this Jan. 29, 2019, file photo, NFL Chief Medical Officer Dr. Allen Sills gestures while speaking during a health and safety tour at Mercedes-Benz Stadium for the NFL Super Bowl 53 football game in Atlanta. Next to torn ACLs, the most time lost for injured NFL players is due to hamstring and lower extremity problems, of which there are far more than the major knee issue. "We are thinking about injury burden," Sills said. "Not only how many injuries but how long a player missed. We plan by the end of year in hopes of making substantial savings of time lost (for players) with those injuries," Sills said. (AP Photo/David J. Phillip, File)
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