Misclassification and selection bias in
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J. M. M. Evans; T. M. Macdonald
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Article
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1997
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John Wiley and Sons
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English
⚖ 134 KB
👁 2 views
Automated databases are increasingly being used for pharmacoepidemiological research and ®eldwork is often carried out to supplement and validate information held within them. In MEMO's case±control studies, patients are identi®ed using computerized ICD9 diagnosis codes, the original medical records