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Table 2 Level of evidence [44].

From: Quality of claims, references and the presentation of risk results in medical journal advertising: a comparative study in Australia, Malaysia and the United States

Level of evidence Definition
I Evidence obtained from a systematic review or metaanalysis
II Evidence obtained from at least one randomized controlled trial.
III Evidence obtained from a comparative study.
IV Other evidence.
  -Evidence obtained from studies which did not assess clinical and public health interventions.
  - Evidence obtained from reviews.