If you aren't sure what's covered by a certain subheading, you can click 
the 
 to get 
information about it.  
E.g., if we click the 
 
next to Etiology:
we see the following info:
Clicking "Continue" takes us back to the previous screen. Then we can check Etiology:
We get these results:
In the Search History, after our Subject Heading it says "/et [Etiology]" -- this reminds us that we chose only one subheading, Etiology. ("et" is just a MEDLINE abbreviation for this subheading.)
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All contents copyright Margaret Fulford © 2004. All rights reserved.