Learn about the literature review process in this video from NC State University Libraries.
Evidence is not always available via filtered resources. Searching the primary literature may be required. It is possible to use specific search strategies in MEDLINE and other databases to achieve the highest possible level of evidence.
Literature reviews can range from quick and dirty to detailed and thorough. When searching for the evidence or working under the title of 'evidence based' it's best to be as detailed and thorough as possible.