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@InsideSportJP: American football and rugby aren't the only sports with head injury / concussion issue. Sumo has yet to deal with that particular time bomb though. Could threaten the very existence of the sport when it explodes. #HIA #Sumo #相撲 #NFL #Concussion #脳震盪 https://t.co/oG5YzBVy9l
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September 25, 2019
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