Why do covariates defined by International Classification of Diseases codes fail to remove confounding in pharmacoepidemiologic studies among seniors?

Title
Why do covariates defined by International Classification of Diseases codes fail to remove confounding in pharmacoepidemiologic studies among seniors?
Authors
Keywords
-
Journal
PHARMACOEPIDEMIOLOGY AND DRUG SAFETY
Volume 20, Issue 8, Pages 858-865
Publisher
Wiley
Online
2011-06-13
DOI
10.1002/pds.2160

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