title: Observational studies and randomized trials.
authors.forename: R P
authors.initials: RP
authors.lastname: Smith
authors.forename: P
authors.initials: P
authors.lastname: Meier
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D015982:Bias; D016022:Case-Control Studies; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D016896:Treatment Outcome
chemical_list: D000319:Adrenergic beta-Antagonists