APPsearch (on main page) contains most of these, so it's advantageous to search them all together there, sometimes.
It's a good practice to start by looking for reviews. Include the word "review" or the phrase "systematic review" with your other search words. PubMed, CINAHL, and PsycINFO allow you to limit results to only systematic reviews.
Have a DOI and need to find out the article?
Type or paste a DOI name (e.g., 10.1000/182) into the text box below.