FOCUS FUNCTION

In our heart diseases search, we would expect to find a lot of articles about heart diseases. We only want those articles where the concept of heart diseases is emphasized. Therefore, we should FOCUS this search.

Sample retrieval with and without FOCUS. (*)

Notice that we have a smaller group of articles that FOCUS on heart diseases.

#	Search History	Results	Display
1	exp heart diseases/	119784	Display
2	exp *heart diseases/	98882	Display

Now that we've learned more about EXPLODE and FOCUS, let's continue our search.

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