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- W2006078185 abstract "To the Editor. — The recent article by Dupont and Page 1 provides a muchneeded review of the studies of estrogens and breast cancer. However, meta-analysis of epidemiologic research faces different problems from those faced by the analysis of data from clinical trials. Evaluating the methods of observational studies, to decide which results to include, presents the first obstacle. Random assignment, placebo control subjects, and blinded assessment have become standard elements of a well-conducted clinical trial. In contrast, there is less agreement over what constitutes acceptable methods in epidemiologic research. 2 The authors chose to exclude few studies, despite substantial differences among the studies in the selection of subjects and control subjects, the definitions of exposure, and the control of potential confounders. The amount and the direction of bias introduced by these differences is controversial. The authors found no obvious connection between methodology and risk estimates. However, bias in individual" @default.
- W2006078185 created "2016-06-24" @default.
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- W2006078185 date "1991-09-01" @default.
- W2006078185 modified "2023-09-25" @default.
- W2006078185 title "Estrogens and breast cancer" @default.
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- W2006078185 doi "https://doi.org/10.1001/archinte.151.9.1882" @default.
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