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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