get_metrics             takes a vector of PMIDs and returns the iCite
                        information for them.
iCiteR                  iCiteR: A package for retrieving citation data
                        from the NIH's iCite API
icite_api               Query the iCite api
icite_search            Query the iCite API using a search strategy
print.icite_api         A simple print method for the icite_api
                        function
search_metrics          Searches the icite database for entries that
                        match the entered criteria
