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Ireland's flanker Sean O'Brien leaves the field after picking up an injury during the international rugby union match between Ireland and Argentina at the Aviva Stadium in Dublin, on November 10, 2018. (Photo by Paul FAITH / AFP) (Photo credit should read PAUL FAITH/AFP via Getty Images)

Ireland's flanker Sean O'Brien leaves the field after picking up an injury during the international rugby union match between Ireland and Argentina at the Aviva Stadium in Dublin, on November 10, 2018. (Photo by Paul FAITH / AFP)        (Photo credit should read PAUL FAITH/AFP via Getty Images)