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(Photo by Rich Graessle/Icon Sportswire via Getty Images)

(TSX / STATS) -- A new study focused on the connection between chronic traumatic encephalopathy and football found the neurodegenerative disease present in 99 percent of the 111 brains donated by families of former NFL players and examined by researchers, according to the study published Tuesday.

Evidence of the disease was found in 177 of 202 total brains examined by researchers from Boston University School of Medicine and VA Boston Healthcare. All specimens belonged to former football players at all levels of the sport.

Of the 111 brains belonging to ex-NFL players, only one showed no trace of CTE upon post-mortem review.

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