How to use the pybliometrics.scopus.utils.check_integrity function in pybliometrics

source_id=item.get('source-id'), author_ids=info.get("auth_ids"),
                      aggregationType=item.get('prism:aggregationType'),
                      issueIdentifier=item.get('prism:issueIdentifier'),
                      pageRange=item.get('prism:pageRange'),
                      author_afids=info.get("auth_afid"), fund_no=item.get('fund-no'),
                      affiliation_country=info.get("aff_country"),
                      citedby_count=item.get('citedby-count'),
                      openaccess=item.get('openaccess'), eIssn=item.get('prism:eIssn'),
                      author_count=item.get('author-count', {}).get('$'),
                      affiliation_city=info.get("aff_city"), afid=info.get("afid"),
                      description=item.get('dc:description'), pii=item.get('pii'),
                      authkeywords=item.get('authkeywords'), eid=item.get('eid'),
                      fund_acr=item.get('fund-acr'), pubmed_id=item.get('pubmed-id'))
            out.append(new)
        # Finalize
        check_integrity(out, self.integrity, self.action)
        return out or None

fields = 'eid name variant documents city country parent'
        aff = namedtuple('Affiliation', fields)
        check_field_consistency(self.integrity, fields)
        # Parse elements one-by-one
        out = []
        for item in self._json:
            name = item.get('affiliation-name')
            variants = [d.get('$', "") for d in item.get('name-variant', [])
                        if d.get('$', "") != name]
            new = aff(eid=item.get('eid'), variant=";".join(variants),
                      documents=item.get('document-count', '0'), name=name,
                      city=item.get('city'), country=item.get('country'),
                      parent=item.get('parent-affiliation-id'))
            out.append(new)
        # Finalize
        check_integrity(out, self.integrity, self.action)
        return out or None

if isinstance(fields, dict):
                fields = [fields]
            areas = ["{} ({})".format(d.get('@abbrev', ''),
                                      d.get('@frequency', ''))
                     for d in fields]
            new = auth(eid=item.get('eid'), initials=name.get('initials'),
                       surname=name.get('surname'), areas="; ".join(areas),
                       givenname=name.get('given-name'),
                       documents=item.get('document-count', '0'),
                       affiliation=aff.get('affiliation-name'),
                       affiliation_id=aff.get('affiliation-id'),
                       city=aff.get('affiliation-city'),
                       country=aff.get('affiliation-country'))
            out.append(new)
        # Finalize
        check_integrity(out, self.integrity, self.action)
        return out or None