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Indirect Versus Direct Evidence in U.S. Preventive Services Task Force Recommendations
TO THE EDITOR:
Clinicians and policymakers rely on the U.S. Preventive Services Task Force (USPSTF) for reliable and accurate information. In their recent update on USPSTF methods, Sawaya and colleagues (1) described USPSTF criteria for constructing and evaluating an indirect “chain of evidence” for the effectiveness of a preventive service when direct evidence from 1 or more randomized effectiveness studies is unavailable. They also stated that their methods for making …
