ctrFindActiveSubstanceSynonyms
                        Find synonyms of an active substance
ctrGetQueryUrlFromBrowser
                        Import from clipboard the URL of a search in
                        one of the registers
ctrLoadQueryIntoDb      Retrieve or update information on clinical
                        trials from register and store in database
ctrOpenSearchPagesInBrowser
                        Open advanced search pages of register(s) or
                        execute search in browser
dbFindFields            Find names of fields in the database collection
dbFindIdsUniqueTrials   Deduplicate records to provide unique clinical
                        trial identifiers
dbGetFieldsIntoDf       Create data frame by extracting specified
                        fields from database collection
dbQueryHistory          Show the history of queries that were loaded
                        into a database
dfListExtractKey        Extract named element(s) from list(s) into
                        long-format data frame
dfMergeTwoVariablesRelevel
                        Merge two variables into one, optionally map
                        values to new levels
installCygwinWindowsDoInstall
                        Convenience function to install a minimal
                        cygwin environment under MS Windows, including
                        perl, sed and php
