Strategies: Searching for Research Instruments in CINAHL:
No one database can search all the medical literature. Searching is an iterative process, and you will need to search several different databases. The databases you search will depend on the topic of your systematic review. According to Finding What Works in Health Care: Standards for Systematic Reviews (Table E-1, page 267), you should search at least two databases, starting with MEDLINE (or PubMed) and the Cochrane Central Register of Controlled Trials. You should also search other subject specific databases that index the literature in your field.