As a free database of filtered and unfiltered evidence it is important to know how to search PubMed correctly.
To find evidence-based information you MUST search PubMed using the Clinical Queries tool. Instructions are available in the attached pdf document. More information about Clinical Queries is available in the factsheet.
For more information about searching PubMed, review the PubMed tutorials at http://www.nlm.nih.gov/bsd/disted/pubmedtutorial/