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FILE - In this June 11, 2019, file photo, Dallas Cowboys' Travis Frederick (72), Connor Williams (52) and Tyron Smith (77) warm up at the team's NFL football training facility in Frisco, Texas. Guillain-Barré syndrome, an autoimmune disease that attacks the nervous system, sapped most of Frederick’s strength and left him struggling to walk when the Cowboys returned from camp in California last summer. Ultimately, the diagnosis wasn’t early enough to save his season. Frederick missed all 18 games last season. (AP Photo/Tony Gutierrez, File)

FILE - In this June 11, 2019, file photo, Dallas Cowboys' Travis Frederick (72), Connor Williams (52) and Tyron Smith (77) warm up at the team's NFL football training facility in Frisco, Texas. Guillain-Barré syndrome, an autoimmune disease that attacks the nervous system, sapped most of Frederick’s strength and left him struggling to walk when the Cowboys returned from camp in California last summer. Ultimately, the diagnosis wasn’t early enough to save his season. Frederick missed all 18 games last season. (AP Photo/Tony Gutierrez, File)

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