entrez_citmatch         Fetch pubmed ids from specially formatted
                        citation strings
entrez_db_links         Can be used in conjunction with 'entrez_link'
                        to find the right name for the 'db' argument in
                        that function.
entrez_db_searchable    Can be used in conjunction with 'entrez_search'
                        to find available search fields to include in
                        the 'term' argument of that function.
entrez_db_summary       Retrieve summary information about an NCBI
                        database
entrez_dbs              List databases avaliable from the NCBI
entrez_fetch            Download data from NCBI databases
entrez_global_query     See how many hits there are for a given term
                        across all NCBI Entrez databases
entrez_info             Get infromation about EUtils databases
entrez_link             Get links to datasets related to a unique ID
                        from an NCBI database
entrez_post             Post IDs to Eutils for later use
entrez_search           Search the NCBI databases using EUtils
entrez_summary          Get summaries of objects in NCBI datasets from
                        a unique ID Constructs a query from the given
                        arguments, including a database name and list
                        of of unique IDs for that database.
parse_pubmed_xml        Summarise an XML record from pubmed.
rentrez                 rentrez
