From: XML Help for PubMed Data Providers
PubMed Help [Internet].
Bethesda (MD): National Center for Biotechnology Information (US); 2005-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
From: XML Help for PubMed Data Providers
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.