Table 1 Pubmed operators used in the study
From: Assessing rare diseases prevalence using literature quantification
Operator | Meaning |
|---|---|
[tiab] | The term is considered as a free text keyword and searched for in abstract and title fields of PubMed citation |
[tw] | The term is considered as a free text keyword and searched for in multiple fields of PubMed citation (title, abstract, MeSH indexing, other keywords etc.) |
[mh] | The term, a MeSH descriptor, and all the terms it subsumes, are searched for in MeSH indexing |
[mh:noexp] | The term, a MeSH descriptor is searched for in MeSH indexing,, but the terms it subsumes are ignored |
[nm] | The term, a MeSH supplementary concept and all the terms it subsumes, are searched for in MeSH indexing |
[nm:noexp] | The term, a MeSH supplementary concept is searched for in MeSH indexing,, but the terms it subsumes are ignored |