title: Undercounting of football concussions skewed NFL research, US investigation alleges.
authors.affiliation: Seattle.
authors.forename: Michael
authors.initials: M
authors.lastname: McCarthy
mesh_terms: D035843:Biomedical Research / Q000706:statistics & numerical data; D001924:Brain Concussion / Q000453:epidemiology*; D005538:Football / Q000293:injuries* / Q000706:statistics & numerical data; D006801:Humans; D012107:Research Design / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology