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Actors Will Smith and Naomie Harris pose for photographers upon arrival at the premiere of the film Collateral Beauty in London on Dec. 15, 2016. Joel Ryan/Invision/AP hide caption

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Joel Ryan/Invision/AP

Dr. Bennet Omalu speaks on stage during the 2015 Health Hero Awards hosted by WebMD on Nov. 5 in New York City. Bryan Bedder/Getty Images hide caption

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Bryan Bedder/Getty Images

Doctor Behind 'Concussion' Wanted To 'Enhance The Lives' Of Football Players

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