title: What can we really learn from observational studies?: the need for empirical assessment of methodology for active drug safety surveillance and comparative effectiveness research.
authors.affiliation: Department of Statistics, Columbia University, New York, NY 10027, USA. madigan@stat.columbia.edu
authors.forename: David
authors.initials: D
authors.lastname: Madigan
authors.forename: Patrick
authors.initials: P
authors.lastname: Ryan
mesh_terms: D057186:Comparative Effectiveness Research / Q000379:methods*; D004341:Drug Evaluation / Q000379:methods; D036262:Empirical Research; D004812:Epidemiologic Methods; D019370:Observation; D017891:Pharmacoepidemiology / Q000379:methods*; D011358:Product Surveillance, Postmarketing / Q000379:methods*; D014481:United States; D014486:United States Food and Drug Administration