level of evidence

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Introduction

A,B,C,D codes or ratings have been applied to recommendations of the USPSTF & other agencies

A:

B:

C:

D:

* clinical trials are not practical for investigations concerning hazardous environmental substances

More general terms

References

  1. Siwek J et al, How to write an evidence-based clinical review article, Am Fam Physician 65:25, 2002