Las Vegas Sun - Photograph : Khan vs. Collazo

January 16, 2018

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Luis Collazo, right, of the U.S. takes a punch from Amir Khan of Great Britain during their welterweight fight at the MGM Grand Garden Arena on Saturday, May 3, 2014. The Professional Fighters Brain Health Study (PFBHS) by the Cleveland Clinic Lou Ruvo Center for Brain Health is collecting data on combat sports athletes.

Steve Marcus

Luis Collazo, right, of the U.S. takes a punch from Amir Khan of Great Britain during their welterweight fight at the MGM Grand Garden Arena on Saturday, May 3, 2014. The Professional Fighters Brain Health Study (PFBHS) by the Cleveland Clinic Lou Ruvo Center for Brain Health is collecting data on combat sports athletes.