From: NLM Catalog
NLM Catalog Help [Internet].
Bethesda (MD): National Center for Biotechnology Information (US); 2007-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
| Examples: |
|---|
| Single subheading: multiple sclerosis/drug therapy [mh] |
| Multiple subheadings: multiple sclerosis/drug therapy [mh] OR multiple sclerosis/complications [mh] |