title: Observational comparative effectiveness research: comparative effectiveness and caveat emptor.
authors.forename: Pamela N
authors.initials: PN
authors.lastname: Peterson
authors.forename: Paul D
authors.initials: PD
authors.lastname: Varosy
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use*; D001281:Atrial Fibrillation / Q000628:therapy*; D017115:Catheter Ablation; D005260:Female; D006801:Humans; D008297:Male
chemical_list: D000889:Anti-Arrhythmia Agents