While databases such as PubMed or Scopus may be the most appropriate when conducting research, there are additional options that may be helpful.
While clinical trials can be searched for in databases like PubMed or Scopus by including search terms for clinical trials or by using filters, there are also numerous databases that focus on clinical trials specifically.
Grey literature is information not commercially published. Examples include conference proceedings and abstracts, dissertations and theses, white papers, government reports, technical notes and reports, and others. Grey literature can provide valuable information for systematic reviews. Below are some resources for finding grey literature.