Embase

You can build searches using PICO framework suitable for systematic reviews or to easily identify all synonyms for a subject for comprehensive retrieval of all related content. 

Using PICO Search

Fill in the PICO elements or select from the autofill list, or search Emtree terms on the right side of the screen. If the term is an Emtree term, a grey synonyms text box will appear next to it. Click it to add all the synonyms to the search.