February 18, 2009 [posted]
PubMed® Subject Subset Strategies Updated for 2009
![graphical image of the letter P](https://webarchive.library.unt.edu/eot2008/20090506201113im_/http://www.nlm.nih.gov/pubs/techbull/new_tb_graphics/p.gif)
PubMed subject subset strategies are reviewed at least once a year to see if modifications are necessary. Modifications may include revisions due to changes in MeSH® vocabulary, adding or deleting terms, and changing parts of a strategy to try to optimize retrieval. The following subset strategies were recently revised: Bioethics, Cancer, Complementary Medicine, Space Life Sciences, and Toxicology.
![](https://webarchive.library.unt.edu/eot2008/20090506201113im_/http://www.nlm.nih.gov/pubs/techbull/new_tb_graphics/black_pixel.gif)
Nahin AM. PubMed® Subject Subset Strategies Updated for 2009. NLM Tech Bull. 2009 Jan-Feb;(366):e12.