get_pmc_cited_in: Finds "cited in" articles from PMC.
In gdancik/pmc2nc: PubMed Central Citation Network Construction

Description Usage Arguments Details Value Examples

'get_pmc_cited_in' takes a vector of article PMIDs and returns elink results containing the PMIDs of articles that cite each of the given articles.

1	get_pmc_cited_in(pmids, batchSize = 200)

`pmids`	a vector of PMIDs look-up
`batchSize`	the batch size to use

Finds articles that cite the provided set of articles. This function is a wrapper for the 'entrez_link' function from 'rentrez'. If more than 1 PMID is specified, requests are made in batches, ensuring that no more than 200 pmids are queried at a time, and that no more than 3 requests are made per second. If an Entrez Key is set, this function allows for 10 requests per second. Entrez keys can be set using 'set_entrez_key(key)'.

For looking up one PMID or one batch, an elink object; for multiple batches, a list of of elink list objects are returned, i.e., the i^{th} element of the list is an elink list object for the i^{th} batch.