Invited commentary: ecologic biases.
Piantadosi
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Johns Hopkins Oncology Center, Baltimore, MD 21206.
D015982:Bias; D004463:Ecology; D015987:Effect Modifier, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans; D016014:Linear Models; D008452:Maximum Allowable Concentration; D015203:Reproducibility of Results