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NORTHAMPTON, ENGLAND - MARCH 27:  George North  of Northampton Saints lies injured after scoring a try and after colliding with Nathan Hughes of Wasps during the Aviva Premiership match between Northampton Saints and Wasps at Franklin's Gardens on March 27, 2015 in Northampton, England.  (Photo by Tony Marshall/Getty Images)
NORTHAMPTON, ENGLAND - MARCH 27:  George North  of Northampton Saints lies injured after scoring a try and after colliding with Nathan Hughes of Wasps during the Aviva Premiership match between Northampton Saints and Wasps at Franklin's Gardens on March 27, 2015 in Northampton, England.  (Photo by Tony Marshall/Getty Images)

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Rugby concussion rule 'not fit for purpose'

Dr. Barry O'Driscoll criticizes World Rugby's concussion protocol after Wales star George North was allowed to return to the field during a club game.

Rugby concussion rule 'not fit for purpose'

Dr. Barry O'Driscoll criticizes World Rugby's concussion protocol after Wales star George North was allowed to return to the field during a club game.