Indexes and abstracts the biomedical literature; includes over 12 million citations from 1966 to the present. Many ways to limit searches, such as clinical trials only. More efficient than PubMed because it links you to Earlham's online & print journals.

1. Enter Medline and put in search terms
2. Limit results by setting "Publication Type" to "Clinical Trials Phase I, etc.
3. Limit to all clinical trials by holding down CTRL while you select each Trial Phase