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A critical appraisal of epidemiological studies comes from basic knowledge: a reader's guide to assess potential for biases

Stefania Boccia email, Giuseppe La Torre email, Roberto Persiani email, Domenico D'Ugo email, Cornelia M van Duijn email and Gualtiero Ricciardi email

World Journal of Emergency Surgery 2007, 2:7doi:10.1186/1749-7922-2-7

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