ctrFindActiveSubstanceSynonyms
                        Find synonyms of an active substance
ctrGetQueryUrl          Get query details
ctrLoadQueryIntoDb      Load and store register trial information
ctrOpenSearchPagesInBrowser
                        Open reigster to show query results or search
                        page
ctrdata                 ctrdata: get started, database connection,
                        function overview
ctrdata-registers       ctrdata: information on clinical trial
                        registers
dbFindFields            Find names of fields in the database collection
dbFindIdsUniqueTrials   Get identifiers of deduplicated trial records
dbGetFieldsIntoDf       Create data frame of specified fields from
                        database collection
dbQueryHistory          Show history of queries loaded into a database
                        collection
dfMergeVariablesRelevel
                        Merge variables, keeping type, and optionally
                        relevel factors
dfName2Value            Get value for variable of interest
dfTrials2Long           Convert data frame with trial records into long
                        format
