University of Pittsburgh's National Sports Brain Bank on June 26, 2023 causality control group CTE +3 experimental group football longitudinal research populations sample causality control group CTE experimental group football longitudinal research populations sample
Aschwanden's "Why We Still Don’t Know How Many NFL Players Have CTE" on January 08, 2019 CTE football medicine sample +1 sampling distribution of the sample mean sampling error CTE football medicine sample sampling distribution of the sample mean sampling error