epmc_annotations_by_id
                        Get annotations by article
epmc_citations          Get citations for a given publication
epmc_db                 Retrieve external database entities referenced
                        in a given publication
epmc_db_count           Retrieve the number of database links from
                        Europe PMC publication database
epmc_details            Get details for individual records
epmc_ftxt               Fetch Europe PMC full texts
epmc_ftxt_book          Fetch Europe PMC books
epmc_hits               Get search result count
epmc_hits_trend         Get the yearly number of hits for a query and
                        the total yearly number of hits for a given
                        period
epmc_lablinks           Get links to external sources
epmc_lablinks_count     Summarise links to external sources
epmc_profile            Obtain a summary of hit counts
epmc_refs               Get references for a given publication
epmc_search             Search Europe PMC publication database
epmc_search_            Get one page of results when searching Europe
                        PubMed Central
epmc_search_by_doi      Search Europe PMC by DOIs
epmc_search_by_doi_     Search Europe PMC by a DOI name
europepmc               europepmc - an R client for the Europe PMC
                        RESTful article API
