But the report doesn't confirm that the condition is common in all football players; it reflects high occurrence in samples at a Boston brain bank that studies CTE. Many donors or their families contributed because of the players' repeated concussions and troubling symptoms before death.
"There are many questions that remain unanswered," said lead author Dr. Ann McKee, a Boston University neuroscientist. That includes, "how common is this" in the general population and all football players?
"How many years of football is too many?" and "What is the genetic risk? Some players do not have evidence of this disease despite long playing years," she noted.
It's also uncertain if some players' lifestyle habits — alcohol, drugs, steroids, diet — might somehow contribute, McKee said.
This study is deeply flawed.
Thousands have played this game at the NFL level and only a handful have have significant issues....
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