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Confounding and effect modification: possible explanation for variation in the results on the association between

P V Ylöstalo1, M L Knuuttila

  • 1Department of Periodontology and Geriatric Dentistry, Institute of Dentistry, University of Oulu, Oulu, Finland. Pekka.Ylostalo@oulu.fi

Journal of Clinical Periodontology
|January 31, 2006
PubMed
Abstract

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