Philadelphia

Ovid Nursing Subject Thesaurus

"Ovid Nursing Subject Thesaurus is a proprietary Controlled Vocabulary and associated Nursing Lexicon which ‘speaks nurse’ to meet the specific needs of nursing professionals of all types and is designed to enhance retrieval of relevant documents for nursing professionals and students. (...) ONST takes the familiar terminology of Medical Subject Headings (MeSH) as a starting point. While the thesaurus is MeSH-compatible, many inverted MeSH headings, (e.g. Education, Continuing) have been flipped to direct order (e.g., Continuing Education).

Emtree

"Comprehensive and polyhierarchically structured, Emtree provides a consistent description of all biomedical terminology, allowing unrivaled drug and disease indexing.