Identify Source Databases
When you look at the Preview for an article, you can find out from which database(s) the Online Articles searched pulled the article. Look for the Source in the Preview. In this case, the article was found in PubMed and MEDLINE.
You may want to use the hyperlinks to go directly to the database(s) and search there. Many individual databases have specialized limitations and refinements that allow you to retrieve more relevant results than you can with Online Articles.