No one index includes all journal articles so you'll need to search multiple databases. There are three main databases to search:
Hedges are search strings created by expert searchers to help you retrieve specific types of studies or topics.
Before you start a systematic review, it's a good idea to see if one has already been published on your topic. There are several places to find them:
Before you start a systematic review, it's a good idea to do a quick scoping search to get an idea of what kinds of studies and how many studies have been written on your topic.