Flashing mouthguards to indicate HIA at World Cup

https://ichef.bbci.co.uk/ace/standard/240/cpsprodpb/d530/live/f0b8d460-7771-11f0-a975-cb151ca452f4.jpg
Players at the Rugby World Cup will wear mouthguards that will flash if they are involved in a collision that merits a head injury assessment.
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