If you can find a review article on your topic -- or an aspect of it -- it can greatly help. Review articles give a summation and synthesis of research done on a particular topic.
These are the top 3 ranked review journals for Clinical Psychology according to SCIMAGO:
Annual Review of Clinical Psychology
TIP: Also limit your search in PsycINFO for just review articles. Find the limit under "Methodology" on the sidebar or wherever limits are found.