There are several ways to refine your Online Articles search without even changing your search terms. The options are all in the left hand panel of the results screen.
If after refining your topic you still have too many articles, then add another word to your search terms. If you have too few articles, then remove a word from your search terms.
You can do further refining to your search in the Advanced Search of Online Articles. Look for the Advanced Search link to the right of the Search button on the results screen.
Some of the many additional search limits available are:
NOTE: Advanced Search is particularly useful when you have a partial citation and need to find an article.
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.