Causation, bias and confounding: a hitchhiker's guide to the epidemiological galaxy Part 2. Principles of causality in epidemiological research: confounding, effect modification and strength of association.
作者信息
Shapiro Samuel
机构信息
Department of Epidemiology, University of Cape Town, Cape Town, South Africa.
出版信息
J Fam Plann Reprod Health Care. 2008 Jul;34(3):185-90. doi: 10.1783/147118908784734873.