Over 600 CTE cases have been published in the literature from multiple international research groups. And of those over 600 cases, 97 percent have confirmed exposure to RHI, primarily through contact and collision sports. CTE has been diagnosed in amateur and professional athletes, including athletes from American, Canadian, and Australian football, rugby union, rugby league, soccer, ice hockey, bull-riding, wrestling, mixed-martial arts, and boxing.
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Source: ScienceDaily