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A definition of causal effect for epidemiological research
  1. Correspondence to:
 Dr M Hernán
 Department of Epidemiology, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA; miguel_hernanpost.harvard.edu
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Hernán MA
A definition of causal effect for epidemiological research

Publication history

  • Accepted August 29, 2003
  • First published March 16, 2004.

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