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SUMSearch simultaneously searches for original studies, systematic reviews, and practice guidelines from multiple sources.
TRIP Database is a clinical search tool designed to allow health professionals to rapidly identify the highest quality clinical evidence for clinical practice.
Health search engine spanning multiple sources and government databases
Mednar - North Grey Literature Collection
Medically-focused federated search engine that queries authoritative medical sites in real time
Evidence Based Medicine Toolkit
Adapted from the Users' Guides series prepared by the Evidence Based Medicine Working Group and originally published in JAMA