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: |
|---|
| hypertension [mh] AND toxicity [sh] |
| therapy [sh:noexp] - Explosion turned off |
| dh [sh] = diet therapy [sh] |