Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2303425537', 'doi': 'https://doi.org/10.1371/journal.pone.0151981', 'title': 'COPD in Nonsmokers: Reports from the Tunisian Population-Based Burden of Obstructive Lung Disease Study', 'display_name': 'COPD in Nonsmokers: Reports from the Tunisian Population-Based Burden of Obstructive Lung Disease Study', 'publication_year': 2016, 'publication_date': '2016-03-24', 'ids': {'openalex': 'https://openalex.org/W2303425537', 'doi': 'https://doi.org/10.1371/journal.pone.0151981', 'mag': '2303425537', 'pmid': 'https://pubmed.ncbi.nlm.nih.gov/27010214', 'pmcid': 'https://www.ncbi.nlm.nih.gov/pmc/articles/4807055'}, 'language': 'en', 'primary_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1371/journal.pone.0151981', 'pdf_url': 'https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0151981&type=printable', 'source': {'id': 'https://openalex.org/S202381698', 'display_name': 'PLoS ONE', 'issn_l': '1932-6203', 'issn': ['1932-6203'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310315706', 'host_organization_name': 'Public Library of Science', 'host_organization_lineage': ['https://openalex.org/P4310315706'], 'host_organization_lineage_names': ['Public Library of Science'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref', 'pubmed'], 'open_access': {'is_oa': True, 'oa_status': 'gold', 'oa_url': 'https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0151981&type=printable', 'any_repository_has_fulltext': True}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5014802516', 'display_name': 'Myriam Denguezli', 'orcid': 'https://orcid.org/0000-0002-4583-1145'}, 'institutions': [{'id': 'https://openalex.org/I8636806', 'display_name': 'University of Sousse', 'ror': 'https://ror.org/00dmpgj58', 'country_code': 'TN', 'type': 'education', 'lineage': ['https://openalex.org/I8636806']}], 'countries': ['TN'], 'is_corresponding': True, 'raw_author_name': 'Meriam Denguezli', 'raw_affiliation_strings': ['Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia'], 'affiliations': [{'raw_affiliation_string': 'Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia', 'institution_ids': ['https://openalex.org/I8636806']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5071918961', 'display_name': 'Hager Daldoul', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I8636806', 'display_name': 'University of Sousse', 'ror': 'https://ror.org/00dmpgj58', 'country_code': 'TN', 'type': 'education', 'lineage': ['https://openalex.org/I8636806']}], 'countries': ['TN'], 'is_corresponding': True, 'raw_author_name': 'Hager Daldoul', 'raw_affiliation_strings': ['Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia'], 'affiliations': [{'raw_affiliation_string': 'Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia', 'institution_ids': ['https://openalex.org/I8636806']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5088369456', 'display_name': 'Imed Harrabi', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I4210087936', 'display_name': 'Hôpital Farhat Hached', 'ror': 'https://ror.org/0059hys23', 'country_code': 'TN', 'type': 'healthcare', 'lineage': ['https://openalex.org/I4210087936']}], 'countries': ['TN'], 'is_corresponding': True, 'raw_author_name': 'Imed Harrabi', 'raw_affiliation_strings': ['Department of Epidemiology, University Hospital Farhat Hached, Sousse, Tunisia'], 'affiliations': [{'raw_affiliation_string': 'Department of Epidemiology, University Hospital Farhat Hached, Sousse, Tunisia', 'institution_ids': ['https://openalex.org/I4210087936']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5080416947', 'display_name': 'Louisa Gnatiuc', 'orcid': 'https://orcid.org/0000-0002-0641-2220'}, 'institutions': [{'id': 'https://openalex.org/I47508984', 'display_name': 'Imperial College London', 'ror': 'https://ror.org/041kmwe10', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I47508984']}], 'countries': ['GB'], 'is_corresponding': True, 'raw_author_name': 'Louisa Gnatiuc', 'raw_affiliation_strings': ['National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom'], 'affiliations': [{'raw_affiliation_string': 'National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom', 'institution_ids': ['https://openalex.org/I47508984']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5058139334', 'display_name': 'Sonia Coton', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I47508984', 'display_name': 'Imperial College London', 'ror': 'https://ror.org/041kmwe10', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I47508984']}], 'countries': ['GB'], 'is_corresponding': True, 'raw_author_name': 'Sonia Coton', 'raw_affiliation_strings': ['National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom'], 'affiliations': [{'raw_affiliation_string': 'National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom', 'institution_ids': ['https://openalex.org/I47508984']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5044492838', 'display_name': 'Peter Burney', 'orcid': 'https://orcid.org/0000-0001-8635-5678'}, 'institutions': [{'id': 'https://openalex.org/I47508984', 'display_name': 'Imperial College London', 'ror': 'https://ror.org/041kmwe10', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I47508984']}], 'countries': ['GB'], 'is_corresponding': True, 'raw_author_name': 'Peter Burney', 'raw_affiliation_strings': ['National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom'], 'affiliations': [{'raw_affiliation_string': 'National Heart and Lung Institute, Imperial College London, Royal Brompton Campus, London, United Kingdom', 'institution_ids': ['https://openalex.org/I47508984']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5066950083', 'display_name': 'Zouhaïr Tabka', 'orcid': 'https://orcid.org/0000-0002-8854-8286'}, 'institutions': [{'id': 'https://openalex.org/I8636806', 'display_name': 'University of Sousse', 'ror': 'https://ror.org/00dmpgj58', 'country_code': 'TN', 'type': 'education', 'lineage': ['https://openalex.org/I8636806']}], 'countries': ['TN'], 'is_corresponding': True, 'raw_author_name': 'Zouhair Tabka', 'raw_affiliation_strings': ['Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia'], 'affiliations': [{'raw_affiliation_string': 'Laboratory of Physiology, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia', 'institution_ids': ['https://openalex.org/I8636806']}]}], 'institution_assertions': [], 'countries_distinct_count': 2, 'institutions_distinct_count': 3, 'corresponding_author_ids': ['https://openalex.org/A5014802516', 'https://openalex.org/A5071918961', 'https://openalex.org/A5088369456', 'https://openalex.org/A5080416947', 'https://openalex.org/A5058139334', 'https://openalex.org/A5044492838', 'https://openalex.org/A5066950083'], 'corresponding_institution_ids': ['https://openalex.org/I8636806', 'https://openalex.org/I8636806', 'https://openalex.org/I4210087936', 'https://openalex.org/I47508984', 'https://openalex.org/I47508984', 'https://openalex.org/I47508984', 'https://openalex.org/I8636806'], 'apc_list': {'value': 1805, 'currency': 'USD', 'value_usd': 1805, 'provenance': 'doaj'}, 'apc_paid': {'value': 1325, 'currency': 'EUR', 'value_usd': 1429, 'provenance': 'openapc'}, 'fwci': 3.529, 'has_fulltext': True, 'fulltext_origin': 'pdf', 'cited_by_count': 47, 'citation_normalized_percentile': {'value': 0.999972, 'is_in_top_1_percent': True, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 96, 'max': 97}, 'biblio': {'volume': '11', 'issue': '3', 'first_page': 'e0151981', 'last_page': 'e0151981'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T10143', 'display_name': 'Chronic Obstructive Pulmonary Disease (COPD) Research', 'score': 1.0, 'subfield': {'id': 'https://openalex.org/subfields/2740', 'display_name': 'Pulmonary and Respiratory Medicine'}, 'field': {'id': 'https://openalex.org/fields/27', 'display_name': 'Medicine'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}, 'topics': [{'id': 'https://openalex.org/T10143', 'display_name': 'Chronic Obstructive Pulmonary Disease (COPD) Research', 'score': 1.0, 'subfield': {'id': 'https://openalex.org/subfields/2740', 'display_name': 'Pulmonary and Respiratory Medicine'}, 'field': {'id': 'https://openalex.org/fields/27', 'display_name': 'Medicine'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}, {'id': 'https://openalex.org/T10322', 'display_name': 'Respiratory Support and Mechanisms', 'score': 0.9917, 'subfield': {'id': 'https://openalex.org/subfields/2740', 'display_name': 'Pulmonary and Respiratory Medicine'}, 'field': {'id': 'https://openalex.org/fields/27', 'display_name': 'Medicine'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}, {'id': 'https://openalex.org/T13770', 'display_name': 'Pediatric health and respiratory diseases', 'score': 0.9903, 'subfield': {'id': 'https://openalex.org/subfields/3604', 'display_name': 'Emergency Medical Services'}, 'field': {'id': 'https://openalex.org/fields/36', 'display_name': 'Health Professions'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}], 'keywords': [], 'concepts': [{'id': 'https://openalex.org/C2776780178', 'wikidata': 'https://www.wikidata.org/wiki/Q199804', 'display_name': 'COPD', 'level': 2, 'score': 0.8685368}, {'id': 'https://openalex.org/C71924100', 'wikidata': 'https://www.wikidata.org/wiki/Q11190', 'display_name': 'Medicine', 'level': 0, 'score': 0.66720164}, {'id': 'https://openalex.org/C2992779976', 'wikidata': 'https://www.wikidata.org/wiki/Q3286546', 'display_name': 'Pulmonary disease', 'level': 2, 'score': 0.57206595}, {'id': 'https://openalex.org/C2908647359', 'wikidata': 'https://www.wikidata.org/wiki/Q2625603', 'display_name': 'Population', 'level': 2, 'score': 0.49951696}, {'id': 'https://openalex.org/C177713679', 'wikidata': 'https://www.wikidata.org/wiki/Q679690', 'display_name': 'Intensive care medicine', 'level': 1, 'score': 0.49826646}, {'id': 'https://openalex.org/C2779134260', 'wikidata': 'https://www.wikidata.org/wiki/Q12136', 'display_name': 'Disease', 'level': 2, 'score': 0.47900006}, {'id': 'https://openalex.org/C3020448403', 'wikidata': 'https://www.wikidata.org/wiki/Q5282120', 'display_name': 'Burden of disease', 'level': 3, 'score': 0.43869972}, {'id': 'https://openalex.org/C74909509', 'wikidata': 'https://www.wikidata.org/wiki/Q10387', 'display_name': 'Gerontology', 'level': 1, 'score': 0.3676859}, {'id': 'https://openalex.org/C126322002', 'wikidata': 'https://www.wikidata.org/wiki/Q11180', 'display_name': 'Internal medicine', 'level': 1, 'score': 0.35989058}, {'id': 'https://openalex.org/C99454951', 'wikidata': 'https://www.wikidata.org/wiki/Q932068', 'display_name': 'Environmental health', 'level': 1, 'score': 0.33907983}], 'mesh': [{'descriptor_ui': 'D000328', 'descriptor_name': 'Adult', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D000368', 'descriptor_name': 'Aged', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D001249', 'descriptor_name': 'Asthma', 'qualifier_ui': 'Q000150', 'qualifier_name': 'complications', 'is_major_topic': False}, {'descriptor_ui': 'D015992', 'descriptor_name': 'Body Mass Index', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D005260', 'descriptor_name': 'Female', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D006801', 'descriptor_name': 'Humans', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D008168', 'descriptor_name': 'Lung', 'qualifier_ui': 'Q000503', 'qualifier_name': 'physiopathology', 'is_major_topic': False}, {'descriptor_ui': 'D008297', 'descriptor_name': 'Male', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D008875', 'descriptor_name': 'Middle Aged', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D015995', 'descriptor_name': 'Prevalence', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D029424', 'descriptor_name': 'Pulmonary Disease, Chronic Obstructive', 'qualifier_ui': 'Q000175', 'qualifier_name': 'diagnosis', 'is_major_topic': False}, {'descriptor_ui': 'D012307', 'descriptor_name': 'Risk Factors', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012907', 'descriptor_name': 'Smoking', 'qualifier_ui': 'Q000009', 'qualifier_name': 'adverse effects', 'is_major_topic': False}, {'descriptor_ui': 'D013147', 'descriptor_name': 'Spirometry', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D014416', 'descriptor_name': 'Tunisia', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}], 'locations_count': 6, 'locations': [{'is_oa': True, 'landing_page_url': 'https://doi.org/10.1371/journal.pone.0151981', 'pdf_url': 'https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0151981&type=printable', 'source': {'id': 'https://openalex.org/S202381698', 'display_name': 'PLoS ONE', 'issn_l': '1932-6203', 'issn': ['1932-6203'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310315706', 'host_organization_name': 'Public Library of Science', 'host_organization_lineage': ['https://openalex.org/P4310315706'], 'host_organization_lineage_names': ['Public Library of Science'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'https://europepmc.org/articles/pmc4807055', 'pdf_url': 'https://europepmc.org/articles/pmc4807055?pdf=render', 'source': {'id': 'https://openalex.org/S4306400806', 'display_name': 'Europe PMC (PubMed Central)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1303153112', 'host_organization_name': 'European Bioinformatics Institute', 'host_organization_lineage': ['https://openalex.org/I1303153112'], 'host_organization_lineage_names': ['European Bioinformatics Institute'], 'type': 'repository'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'https://ora.ox.ac.uk/objects/uuid:0314a3e5-2947-4c6d-8024-f418f08cac54', 'pdf_url': 'https://ora.ox.ac.uk/objects/uuid:0314a3e5-2947-4c6d-8024-f418f08cac54/files/mc7b2f8fadb94dfb4d6d6f7304675d808', 'source': {'id': 'https://openalex.org/S4306402636', 'display_name': 'Oxford University Research Archive (ORA) (University of Oxford)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I40120149', 'host_organization_name': 'University of Oxford', 'host_organization_lineage': ['https://openalex.org/I40120149'], 'host_organization_lineage_names': ['University of Oxford'], 'type': 'repository'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'http://hdl.handle.net/10044/1/30400', 'pdf_url': 'http://spiral.imperial.ac.uk/bitstream/10044/1/30400/7/journal.pone.0151981.PDF', 'source': {'id': 'https://openalex.org/S4306401396', 'display_name': 'Spiral (Imperial College London)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I47508984', 'host_organization_name': 'Imperial College London', 'host_organization_lineage': ['https://openalex.org/I47508984'], 'host_organization_lineage_names': ['Imperial College London'], 'type': 'repository'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': True, 'landing_page_url': 'https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4807055', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S2764455111', 'display_name': 'PubMed Central', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1299303238', 'host_organization_name': 'National Institutes of Health', 'host_organization_lineage': ['https://openalex.org/I1299303238'], 'host_organization_lineage_names': ['National Institutes of Health'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': False, 'landing_page_url': 'https://pubmed.ncbi.nlm.nih.gov/27010214', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306525036', 'display_name': 'PubMed', 'issn_l': None, 'issn': None, 'is_oa': False, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1299303238', 'host_organization_name': 'National Institutes of Health', 'host_organization_lineage': ['https://openalex.org/I1299303238'], 'host_organization_lineage_names': ['National Institutes of Health'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1371/journal.pone.0151981', 'pdf_url': 'https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0151981&type=printable', 'source': {'id': 'https://openalex.org/S202381698', 'display_name': 'PLoS ONE', 'issn_l': '1932-6203', 'issn': ['1932-6203'], 'is_oa': True, 'is_in_doaj': True, 'is_core': True, 'host_organization': 'https://openalex.org/P4310315706', 'host_organization_name': 'Public Library of Science', 'host_organization_lineage': ['https://openalex.org/P4310315706'], 'host_organization_lineage_names': ['Public Library of Science'], 'type': 'journal'}, 'license': 'cc-by', 'license_id': 'https://openalex.org/licenses/cc-by', 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'sustainable_development_goals': [{'score': 0.86, 'id': 'https://metadata.un.org/sdg/3', 'display_name': 'Good health and well-being'}], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 55, 'referenced_works': ['https://openalex.org/W1865292579', 'https://openalex.org/W1899678835', 'https://openalex.org/W1968764074', 'https://openalex.org/W1969444407', 'https://openalex.org/W2006165648', 'https://openalex.org/W2006734783', 'https://openalex.org/W2009626240', 'https://openalex.org/W2010497705', 'https://openalex.org/W2020863153', 'https://openalex.org/W2022799351', 'https://openalex.org/W2035851612', 'https://openalex.org/W203985185', 'https://openalex.org/W2045331482', 'https://openalex.org/W2068048185', 'https://openalex.org/W2080270645', 'https://openalex.org/W2091614744', 'https://openalex.org/W2093300403', 'https://openalex.org/W2095304203', 'https://openalex.org/W2097820588', 'https://openalex.org/W2099459324', 'https://openalex.org/W2099676542', 'https://openalex.org/W2108678383', 'https://openalex.org/W2110367477', 'https://openalex.org/W2111266457', 'https://openalex.org/W2112495658', 'https://openalex.org/W2116141140', 'https://openalex.org/W2118262490', 'https://openalex.org/W2119767177', 'https://openalex.org/W2119834243', 'https://openalex.org/W2124879124', 'https://openalex.org/W2127422871', 'https://openalex.org/W2127951128', 'https://openalex.org/W2128341778', 'https://openalex.org/W2128643205', 'https://openalex.org/W2129236465', 'https://openalex.org/W2129546035', 'https://openalex.org/W2129832405', 'https://openalex.org/W2132102924', 'https://openalex.org/W2135326460', 'https://openalex.org/W2135414619', 'https://openalex.org/W2142450964', 'https://openalex.org/W2144138285', 'https://openalex.org/W2155767904', 'https://openalex.org/W2156265400', 'https://openalex.org/W2160992568', 'https://openalex.org/W2161469589', 'https://openalex.org/W2166841037', 'https://openalex.org/W2266909492', 'https://openalex.org/W2317485334', 'https://openalex.org/W2604596332', 'https://openalex.org/W2885109827', 'https://openalex.org/W3215332570', 'https://openalex.org/W4211263216', 'https://openalex.org/W4251901755', 'https://openalex.org/W64362699'], 'related_works': ['https://openalex.org/W2923872113', 'https://openalex.org/W2585009645', 'https://openalex.org/W2472126364', 'https://openalex.org/W2372297656', 'https://openalex.org/W2333131755', 'https://openalex.org/W2326585857', 'https://openalex.org/W2320098543', 'https://openalex.org/W2312864656', 'https://openalex.org/W2312602415', 'https://openalex.org/W142525846'], 'abstract_inverted_index': {'Background': [0], "It's": [1], 'currently': [2], 'well': [3], 'known': [4, 25], 'that': [5, 248], 'smoking': [6], 'and': [7, 39, 82, 131, 144, 196, 209, 228, 265, 274], 'increasing': [8], 'age': [9], 'constitute': [10], 'the': [11, 40, 48, 67, 99, 105, 127, 138, 153, 162, 183, 186], 'most': [12], 'important': [13], 'risk': [14, 37, 78, 238], 'factors': [15, 38, 79], 'for': [16, 80, 90, 108, 126, 140, 180, 239], 'chronic': [17, 276], 'obstructive': [18], 'pulmonary': [19], 'disease': [20], '(COPD).': [21], 'However,': [22], 'little': [23], 'is': [24], 'about': [26, 73], 'COPD': [27, 43, 81, 94, 165, 172, 240, 260], 'among': [28, 44, 214], 'nonsmokers.': [29, 242], 'The': [30, 114], 'present': [31], 'study': [32, 244], 'aimed': [33], 'to': [34, 104, 174, 272], 'investigate': [35], 'prevalence,': [36], 'profiles': [41], 'of': [42, 51, 75, 84, 92, 117, 161, 171, 176, 182, 190, 232, 254], 'nonsmokers': [45, 163, 205, 249], 'based': [46, 97], 'on': [47, 98], 'Tunisian': [49], 'Burden': [50], 'Obstructive': [52, 109], 'Lung': [53, 110], 'Disease': [54, 111], '(BOLD)': [55], 'study.': [56], 'Methods': [57], '807': [58], 'adults': [59], 'aged': [60], '40': [61], 'years+': [62], 'were': [63, 149, 193, 212], 'randomly': [64], 'selected': [65], 'from': [66], 'general': [68], 'population.': [69], 'We': [70], 'collected': [71], 'information': [72], 'history': [74], 'respiratory': [76], 'disease,': [77], 'quality': [83], 'life.': [85], 'Post-bronchodilator': [86], 'spirometry': [87], 'was': [88, 96, 120, 155], 'performed': [89], 'assessment': [91], 'COPD.': [93, 146, 191, 217, 257], 'diagnostic': [95], 'post-bronchodilator': [100], 'FEV1/FVC': [101, 128], 'ratio,': [102], 'according': [103], 'Global': [106], 'Initiative': [107], '(GOLD)': [112], 'guidelines.': [113], 'lower': [115, 224], 'limit': [116], 'normal': [118], '(LLN)': [119], 'determined': [121], 'as': [122, 157], 'an': [123], 'alternative': [124], 'threshold': [125], 'ratio.': [129], 'Results': [130], 'Conclusions': [132], 'Among': [133, 204], '485': [134], 'nonsmokers,': [135], '4.7%': [136], 'met': [137], 'criteria': [139, 189], 'GOLD': [141, 187], 'grade': [142], 'I': [143], 'higher': [145, 210], 'These': [147], 'proportions': [148], 'similar': [150], 'even': [151], 'when': [152], 'LLN': [154], 'used': [156], 'a': [158, 167, 229, 251, 262], 'threshold.': [159], 'None': [160], 'with': [164, 216, 236, 256, 259], 'reported': [166, 197], 'previous': [168, 230, 246], 'doctor': [169], 'diagnosis': [170, 231], 'compared': [173], '7.1%': [175], 'smokers.': [177, 203], 'Nonsmokers': [178, 192, 258], 'accounted': [179], '45.1%': [181], 'subjects': [184], 'fulfilling': [185], 'spirometric': [188], 'predominately': [194], 'men': [195], 'more': [198, 207], 'asthma': [199, 233], 'problems': [200], 'than': [201], 'obstructed': [202], 'significantly': [206], 'symptoms': [208], 'co-morbidity': [211], 'found': [213], 'those': [215], 'Increasing': [218], 'age,': [219], 'male': [220], 'gender,': [221], 'occupational': [222], 'exposure,': [223], 'body': [225], 'mass': [226], 'index': [227], 'are': [234], 'associated': [235], 'increased': [237], 'in': [241], 'This': [243], 'confirms': [245], 'evidence': [247], 'comprise': [250], 'substantial': [252], 'proportion': [253], 'individuals': [255], 'have': [261], 'specific': [263], 'profile': [264], 'should,': [266], 'thus,': [267], 'receive': [268], 'far': [269], 'greater': [270], 'attention': [271], 'prevent': [273], 'treat': [275], 'airway': [277], 'obstruction.': [278]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2303425537', 'counts_by_year': [{'year': 2024, 'cited_by_count': 5}, {'year': 2023, 'cited_by_count': 9}, {'year': 2022, 'cited_by_count': 6}, {'year': 2021, 'cited_by_count': 4}, {'year': 2020, 'cited_by_count': 7}, {'year': 2019, 'cited_by_count': 6}, {'year': 2018, 'cited_by_count': 5}, {'year': 2017, 'cited_by_count': 3}, {'year': 2016, 'cited_by_count': 1}], 'updated_date': '2024-12-18T15:44:08.358867', 'created_date': '2016-06-24'}