checkRemoteFileAvailable
                        Check if a given remote file is available for
                        download
checkTablesColumns      Check if the given tables and columns are valid
                        and return the loaded data.
downloadTestData        Download Test Data Files
generateTestTables      Generates an Excel file with sheets that
                        correspond to an OMOP-CDM tables.
graphCohort             'graphCohort()' aids in the visualisation of
                        cohorts timelines, useful to get a grip on
                        intersections.
patientsCDM             Pushes test population into a blank CDM.
readPatients            Converts a sample of patients into Unit Testing
                        Definition JSON file.
readPatients.csv        Converts a sample of patients in CSV format
                        into a Unit Testing Definition JSON file.
readPatients.xl         Converts a sample of patients in XLSX format
                        into Unit Testing Definition JSON file.
