Researchers have been studying chronic traumatic encephalopathy (CTE) and while much has been learned, diagnosing the disease still needs to be done post-mortem on autopsied brains donated to a brain bank. One criticism of the research is that brain bank study results have a selection bias because they are based on a subset of players most affected by CTE, and therefore not representative of the population of football players. Now a novel study by researchers from BUSM and Boston University School of Public Health (BUSPH) provides further evidence suggesting a dose-response relationship between football and CTE even after adjusting for selection bias.