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Level 6 example (from N Eng J Med) - see Level 5 example for a synopsis of this study
Search Across the Levels
It is possible with these federated search engines to search across many resources, with the retrieval sorted according to the source of the evidence. Haynes (2006) cautions, however, that "the quality of the retrieval depends on the source, and many sources do not provide critical appraisal of evidence."