Extract PubMed ID from elink object

Extract PubMed ID from an elink object.

Usage

# S3 method for elink
extract_pmid(x, linkname = NULL, quietly = FALSE, no_result = "error", ...)

Arguments

x

An elink object, generated by rentrez::entrez_link and it's derivatives (e.g. citedby_pmid).

linkname

linkname as specified for Entrez API; only necessary if more than one linkname is returned from PubMed.

quietly

Suppress PubMed linkname message when linkname is not specified and multiple results exist in an elink object.

no_result

The type of condition that should be signaled when no PubMed results exist in a response; one of "error", "warning" (default), "message" or "none".

...

Unused, included for generic consistency only.

See also

Other extract_pmid_methods: extract_pmid.elink_list(), extract_pmid()