title: Pediatric concussions in United States emergency departments: the tip of the iceberg.
authors.forename: James M
authors.initials: JM
authors.lastname: Callahan
mesh_terms: D001924:Brain Concussion / Q000453:epidemiology*; D002648:Child; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D006801:Humans; D014481:United States