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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
Using Filters to Get Specific
Using filters will help you find only the relevant information that you really need. You can start with a broad topic and then let PubMed filters help you narrow it down.
PubMed has a plethora of helpful guides for searching and using the database. Start with the PubMed Quick Start.
A good way to get only the most relevant articles on your topic is to use the Advanced Search Builder and search the Title/Abstract fields. The title and abstract (summary including test subjects, methods, etc.) should indicate the focus of an article.
This is true of nearly all database search engines.
20191024 - rrh