PubMed® comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

https://pubmed.ncbi.nlm.nih.gov/32600378/

Trials is a Biomedical International Journal, that encompasses all aspects of the performance and findings of randomized controlled trials in health. Trials publish articles on general trial methodology and research into trial processes, as well as study protocols and statistical analysis plans for randomised controlled trials, commentaries and traditional results papers – regardless of outcome or significance of findings.

https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-020-04494-w