Causation, bias and confounding: a hitchhiker's guide to the epidemiological galaxy. Introductory comments.
Shapiro
Samuel
S
Department of Epidemiology, University of Cape Town, Cape Town, South Africa. samshap@mweb.co.za
D015982:Bias; D015984:Causality; D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans