What can we really learn from observational studies?: the need for empirical assessment of methodology for active drug safety surveillance and comparative effectiveness research

MeSH terms

• Comparative Effectiveness Research / methods*
• Drug Evaluation / methods
• Empirical Research*
• Epidemiologic Methods
• Observation*
• Pharmacoepidemiology / methods*
• Product Surveillance, Postmarketing / methods*
• United States
• United States Food and Drug Administration