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Grey Literature

Introduction - Clinical trials

A clinical trial is 

"a formal testing of a specific treatment or other health-related intervention to determine its role in the standard care of individuals with a corresponding medical condition".

Clinical trial. (2018). In Encyclopaedia Britannica. Retrieved from

Clinical trials can be found in Clinical Trial registries and are also indexed in databases. See the Health page in this guide for a list of locations to search.

Another approach is to employ the Hand Searching technique.