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Editorial
. 2004 Jun 1;140(11):923-4.
doi: 10.7326/0003-4819-140-11-200406010-00014.

Observational studies of treatment effectiveness: some cautions

Andreas Laupacis, Muhammad Mamdani
Editorial

Observational studies of treatment effectiveness: some cautions

Andreas Laupacis et al. Ann Intern Med. .
No abstract available

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