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Title
Analysis of observational studies in the presence of treatment selection bias: effects of invasive cardiac management on AMI survival using propensity score and instrumental variable methods.
Authors
Stukel, Thérèse A; Fisher, Elliott S; Wennberg, David E; Alter, David A; Gottlieb, Daniel J; Vermeulen, Marian J
Abstract
Comparisons of outcomes between patients treated and untreated in observational studies may be biased due to differences in patient prognosis between groups, often because of unobserved treatment selection biases.