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PubMed Clinical Queries
The Clinical Study Categories filter searches on questions of therapy, diagnosis, etiology, prognosis, or clinical prediction guides by looking for the highest levels of evidence in the literature. These filters can also be limited to a broad or narrow scope. Clinical filters are imposed behind the scenes by the search engine based on the work of B. Haynes, et al, on the best strategies for retrieving clinically relevant information from MEDLINE.
Levels of evidence
from Oxford Centre for Evidence-based medicine