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Brain disease in dead NFL players 'higher than previously shown'

Photo: BBC World

What happened

A new study says at least one in four ex-NFL players who died between 2016 and 2021 had a degenerative brain disease but the true figure could be much higher.

Summary assembled by rule from the sources below

Why it's spreading

Timeline

  1. First appeared on BBC SportBBC Sport
  2. BBC World started reportingBBC World

Sources