@jepcastel

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

, and . Epidemiology (Cambridge, Mass.), 22 (5): 629-31 (September 2011)6412<m:linebreak></m:linebreak>JID: 9009644; CIN: Epidemiology. 2011 Sep;22(5):636-7. PMID: 21811112; ppublish;<m:linebreak></m:linebreak>CER.
DOI: 10.1097/EDE.0b013e318228ca1d

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