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Knockout that left Montreal boxer in coma prompts safety questions

Montreal boxer Adonis Stevenson remains in a Quebec City hospital after suffering a 'severe traumatic brain injury' in a knockout loss on Saturday. The incident has sparked a debate about the combat sport and what, if anything, can be done to make it safer.
Montreal boxer Adonis Stevenson remains in a Quebec City hospital after suffering a 'severe traumatic brain injury' in a knockout loss on Saturday. The incident has sparked a debate about the combat sport and what, if anything, can be done to make it safer. 3:28