title: Observational comparative effectiveness studies of drug therapies: high-quality answers or important clinical questions?: comment on "Comparative effectiveness of 2 β-blockers in hypertensive patients".
authors.affiliation: Cardiovascular Health Research Unit, University of Washington, Seattle, 98101, USA. jfloyd@uw.edu
authors.forename: James S
authors.initials: JS
authors.lastname: Floyd
authors.forename: Bruce M
authors.initials: BM
authors.lastname: Psaty
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D005260:Female; D006333:Heart Failure / Q000453:epidemiology*; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D008297:Male; D009203:Myocardial Infarction / Q000453:epidemiology*; D020521:Stroke / Q000453:epidemiology*
chemical_list: D000319:Adrenergic beta-Antagonists