ctrFindActiveSubstanceSynonyms
                        Find synonyms of an active substance
ctrGenerateQueries      Generates queries that work across registers
ctrGetQueryUrl          Get register name and query parameters from
                        search URL
ctrLoadQueryIntoDb      Load and store register trial information
ctrOpenSearchPagesInBrowser
                        Open register to show query results or search
                        page
ctrShowOneTrial         Show full structure and all data of a trial
ctrdata                 Getting started, database connection, function
                        overview
ctrdata-registers       Information on clinical trial registers
ctrdata-trial-concepts
                        Trial concepts implemented across registers
dbFindFields            Find names of fields in the database collection
dbFindIdsUniqueTrials   Get identifiers of deduplicated trial records
dbGetFieldsIntoDf       Create data frame of specified fields or trial
                        concepts from database collection
dbQueryHistory          Show history of queries loaded into collection
dfMergeVariablesRelevel
                        Merge variables, keeping type where possible,
                        optionally relevel factors
dfName2Value            Get value for variable of interest
dfTrials2Long           Convert data frame with trial records into long
                        format
f.assignmentType        Calculate type of assignment to intervention in
                        a study
f.controlType           Calculate type of control data collected in a
                        study
f.externalLinks         Calculate the external references from a
                        study's register record
f.hasResults            Calculate if a study's results are available
f.isMedIntervTrial      Calculate if study is a medicine-interventional
                        study
f.isUniqueTrial         Calculate if record is unique for a study
f.likelyPlatformTrial   Calculate if study is likely a platform trial
                        or not
f.numSites              Calculate number of sites of a study
f.numTestArmsSubstances
                        Calculate number of arms or groups with
                        investigational medicines in a study
f.primaryEndpointDescription
                        Calculate details of a primary endpoint of a
                        study
f.primaryEndpointResults
                        Calculate details of a study's primary endpoint
                        analysis and testing
f.resultsDate           Calculate date of results of a study
f.sampleSize            Calculate sample size of a study
f.sponsorType           Calculate type of sponsor of a study
f.startDate             Calculate start date of a study
f.statusRecruitment     Calculate status of recruitment of a study
f.trialObjectives       Calculate objectives of a study
f.trialPhase            Calculate phase of a clinical trial
f.trialPopulation       Calculate in- and exclusion criteria and age
                        groups
f.trialTitle            Calculate the title of a study
