Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2064147974', 'doi': 'https://doi.org/10.1542/peds.112.5.1016', 'title': 'Postnatal Serum Insulin-Like Growth Factor I Deficiency Is Associated With Retinopathy of Prematurity and Other Complications of Premature Birth', 'display_name': 'Postnatal Serum Insulin-Like Growth Factor I Deficiency Is Associated With Retinopathy of Prematurity and Other Complications of Premature Birth', 'publication_year': 2003, 'publication_date': '2003-11-01', 'ids': {'openalex': 'https://openalex.org/W2064147974', 'doi': 'https://doi.org/10.1542/peds.112.5.1016', 'mag': '2064147974', 'pmid': 'https://pubmed.ncbi.nlm.nih.gov/14595040'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1542/peds.112.5.1016', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S77494981', 'display_name': 'PEDIATRICS', 'issn_l': '0031-4005', 'issn': ['0031-4005', '1098-4275'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310315734', 'host_organization_name': 'American Academy of Pediatrics', 'host_organization_lineage': ['https://openalex.org/P4310315734'], 'host_organization_lineage_names': ['American Academy of Pediatrics'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref', 'pubmed'], 'open_access': {'is_oa': False, 'oa_status': 'closed', 'oa_url': None, 'any_repository_has_fulltext': False}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5016603204', 'display_name': 'Ann Hellström', 'orcid': 'https://orcid.org/0000-0002-9259-1244'}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Ann Hellström', 'raw_affiliation_strings': ['Department of Ophthalmology, Institute of Clinical Neuroscience', 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children'], 'affiliations': [{'raw_affiliation_string': 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children', 'institution_ids': []}, {'raw_affiliation_string': 'Department of Ophthalmology, Institute of Clinical Neuroscience', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5111550251', 'display_name': 'Eva Engström', 'orcid': None}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Eva Engström', 'raw_affiliation_strings': ['Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children'], 'affiliations': [{'raw_affiliation_string': 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5006878711', 'display_name': 'Anna‐Lena Hård', 'orcid': 'https://orcid.org/0000-0002-2440-2851'}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Anna-Lena Hård', 'raw_affiliation_strings': ['Department of Ophthalmology, Institute of Clinical Neuroscience'], 'affiliations': [{'raw_affiliation_string': 'Department of Ophthalmology, Institute of Clinical Neuroscience', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5090194433', 'display_name': 'Kerstin Albertsson‐Wikland', 'orcid': 'https://orcid.org/0000-0003-3167-0667'}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Kerstin Albertsson-Wikland', 'raw_affiliation_strings': ['Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children'], 'affiliations': [{'raw_affiliation_string': 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5041345164', 'display_name': 'Björn Carlsson', 'orcid': 'https://orcid.org/0000-0002-3023-9878'}, 'institutions': [{'id': 'https://openalex.org/I881427289', 'display_name': 'University of Gothenburg', 'ror': 'https://ror.org/01tm6cn81', 'country_code': 'SE', 'type': 'education', 'lineage': ['https://openalex.org/I881427289']}], 'countries': ['SE'], 'is_corresponding': False, 'raw_author_name': 'Björn Carlsson', 'raw_affiliation_strings': ['Research Center for Endocrinology and Metabolism, Department of Internal Medicine, Sahlgrenska Academy at Göteborg University, Göteborg'], 'affiliations': [{'raw_affiliation_string': 'Research Center for Endocrinology and Metabolism, Department of Internal Medicine, Sahlgrenska Academy at Göteborg University, Göteborg', 'institution_ids': ['https://openalex.org/I881427289']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5044631640', 'display_name': 'Aimon Niklasson', 'orcid': 'https://orcid.org/0000-0001-5839-4207'}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Aimon Niklasson', 'raw_affiliation_strings': ['Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children'], 'affiliations': [{'raw_affiliation_string': 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5054835375', 'display_name': 'Chatarina Löfqvist', 'orcid': 'https://orcid.org/0000-0003-4371-5164'}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Chatarina Löfqvist', 'raw_affiliation_strings': ['Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children'], 'affiliations': [{'raw_affiliation_string': 'Göteborg Pediatric Growth Research Center, Department of Pediatrics, Institute of the Health of Women and Children', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5047711492', 'display_name': 'Elisabeth Svensson', 'orcid': 'https://orcid.org/0000-0001-7210-1925'}, 'institutions': [{'id': 'https://openalex.org/I26437253', 'display_name': 'Örebro University', 'ror': 'https://ror.org/05kytsw45', 'country_code': 'SE', 'type': 'education', 'lineage': ['https://openalex.org/I26437253']}], 'countries': ['SE'], 'is_corresponding': False, 'raw_author_name': 'Elisabeth Svensson', 'raw_affiliation_strings': ['Medical Statistics, Örebro University, Örebro'], 'affiliations': [{'raw_affiliation_string': 'Medical Statistics, Örebro University, Örebro', 'institution_ids': ['https://openalex.org/I26437253']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5102150038', 'display_name': 'Sture Holm', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I66862912', 'display_name': 'Chalmers University of Technology', 'ror': 'https://ror.org/040wg7k59', 'country_code': 'SE', 'type': 'education', 'lineage': ['https://openalex.org/I66862912']}], 'countries': ['SE'], 'is_corresponding': False, 'raw_author_name': 'Sture Holm', 'raw_affiliation_strings': ['Biostatistics Branch, Department of Mathematical Statistics, Chalmers University of Technology, Göteborg, Sweden'], 'affiliations': [{'raw_affiliation_string': 'Biostatistics Branch, Department of Mathematical Statistics, Chalmers University of Technology, Göteborg, Sweden', 'institution_ids': ['https://openalex.org/I66862912']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5066099568', 'display_name': 'Uwe Ewald', 'orcid': None}, 'institutions': [], 'countries': [], 'is_corresponding': False, 'raw_author_name': 'Uwe Ewald', 'raw_affiliation_strings': ['Departments of Women’s and Children’s Health'], 'affiliations': [{'raw_affiliation_string': 'Departments of Women’s and Children’s Health', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5073662614', 'display_name': 'Gerd Holmström', 'orcid': 'https://orcid.org/0000-0002-5600-7186'}, 'institutions': [{'id': 'https://openalex.org/I123387679', 'display_name': 'Uppsala University', 'ror': 'https://ror.org/048a87296', 'country_code': 'SE', 'type': 'education', 'lineage': ['https://openalex.org/I123387679']}], 'countries': ['SE'], 'is_corresponding': False, 'raw_author_name': 'Gerd Holmström', 'raw_affiliation_strings': ['Ophthalmology, Uppsala University, Uppsala, Sweden'], 'affiliations': [{'raw_affiliation_string': 'Ophthalmology, Uppsala University, Uppsala, Sweden', 'institution_ids': ['https://openalex.org/I123387679']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5091304323', 'display_name': 'Lois E. H. Smith', 'orcid': 'https://orcid.org/0000-0001-7644-6410'}, 'institutions': [{'id': 'https://openalex.org/I136199984', 'display_name': 'Harvard University', 'ror': 'https://ror.org/03vek6s52', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I136199984']}, {'id': 'https://openalex.org/I1288882113', 'display_name': "Boston Children's Hospital", 'ror': 'https://ror.org/00dvg7y05', 'country_code': 'US', 'type': 'healthcare', 'lineage': ['https://openalex.org/I1288882113']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'Lois E. H. Smith', 'raw_affiliation_strings': ['Department of Ophthalmology, Children’s Hospital, Harvard Medical School, Boston, Massachusetts'], 'affiliations': [{'raw_affiliation_string': 'Department of Ophthalmology, Children’s Hospital, Harvard Medical School, Boston, Massachusetts', 'institution_ids': ['https://openalex.org/I136199984', 'https://openalex.org/I1288882113']}]}], 'institution_assertions': [], 'countries_distinct_count': 2, 'institutions_distinct_count': 6, 'corresponding_author_ids': [], 'corresponding_institution_ids': [], 'apc_list': None, 'apc_paid': None, 'fwci': 13.662, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 519, 'citation_normalized_percentile': {'value': 0.999911, 'is_in_top_1_percent': True, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 99, 'max': 100}, 'biblio': {'volume': '112', 'issue': '5', 'first_page': '1016', 'last_page': '1020'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T12484', 'display_name': 'Retinopathy of Prematurity Studies', 'score': 1.0, 'subfield': {'id': 'https://openalex.org/subfields/2741', 'display_name': 'Radiology, Nuclear Medicine and Imaging'}, '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/T12484', 'display_name': 'Retinopathy of Prematurity Studies', 'score': 1.0, 'subfield': {'id': 'https://openalex.org/subfields/2741', 'display_name': 'Radiology, Nuclear Medicine and Imaging'}, '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/T10549', 'display_name': 'Neonatal Respiratory Health Research', 'score': 0.9995, '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/T12068', 'display_name': 'Neonatal Health and Biochemistry', 'score': 0.998, 'subfield': {'id': 'https://openalex.org/subfields/2735', 'display_name': 'Pediatrics, Perinatology and Child Health'}, 'field': {'id': 'https://openalex.org/fields/27', 'display_name': 'Medicine'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/necrotizing-enterocolitis', 'display_name': 'Necrotizing Enterocolitis', 'score': 0.8499341}, {'id': 'https://openalex.org/keywords/bronchopulmonary-dysplasia', 'display_name': 'Bronchopulmonary Dysplasia', 'score': 0.80656374}], 'concepts': [{'id': 'https://openalex.org/C2779918416', 'wikidata': 'https://www.wikidata.org/wiki/Q1423087', 'display_name': 'Retinopathy of prematurity', 'level': 4, 'score': 0.95771754}, {'id': 'https://openalex.org/C71924100', 'wikidata': 'https://www.wikidata.org/wiki/Q11190', 'display_name': 'Medicine', 'level': 0, 'score': 0.94922495}, {'id': 'https://openalex.org/C2779303187', 'wikidata': 'https://www.wikidata.org/wiki/Q10859678', 'display_name': 'Necrotizing enterocolitis', 'level': 2, 'score': 0.8499341}, {'id': 'https://openalex.org/C2778721537', 'wikidata': 'https://www.wikidata.org/wiki/Q922640', 'display_name': 'Bronchopulmonary dysplasia', 'level': 4, 'score': 0.80656374}, {'id': 'https://openalex.org/C2779252433', 'wikidata': 'https://www.wikidata.org/wiki/Q6058597', 'display_name': 'Intraventricular hemorrhage', 'level': 4, 'score': 0.55080795}, {'id': 'https://openalex.org/C2780689927', 'wikidata': 'https://www.wikidata.org/wiki/Q24766801', 'display_name': 'Insulin-like growth factor', 'level': 4, 'score': 0.5140692}, {'id': 'https://openalex.org/C66322754', 'wikidata': 'https://www.wikidata.org/wiki/Q4128476', 'display_name': 'Birth weight', 'level': 3, 'score': 0.47347963}, {'id': 'https://openalex.org/C50440223', 'wikidata': 'https://www.wikidata.org/wiki/Q1475848', 'display_name': 'Risk factor', 'level': 2, 'score': 0.45926133}, {'id': 'https://openalex.org/C188816634', 'wikidata': 'https://www.wikidata.org/wiki/Q2113324', 'display_name': 'Prospective cohort study', 'level': 2, 'score': 0.45514113}, {'id': 'https://openalex.org/C187212893', 'wikidata': 'https://www.wikidata.org/wiki/Q123028', 'display_name': 'Pediatrics', 'level': 1, 'score': 0.45341477}, {'id': 'https://openalex.org/C2779083892', 'wikidata': 'https://www.wikidata.org/wiki/Q6692979', 'display_name': 'Low birth weight', 'level': 3, 'score': 0.43935996}, {'id': 'https://openalex.org/C2778376644', 'wikidata': 'https://www.wikidata.org/wiki/Q2253111', 'display_name': 'Gestational age', 'level': 3, 'score': 0.33357024}, {'id': 'https://openalex.org/C126322002', 'wikidata': 'https://www.wikidata.org/wiki/Q11180', 'display_name': 'Internal medicine', 'level': 1, 'score': 0.2958357}, {'id': 'https://openalex.org/C2775960820', 'wikidata': 'https://www.wikidata.org/wiki/Q408378', 'display_name': 'Growth factor', 'level': 3, 'score': 0.2864838}, {'id': 'https://openalex.org/C2779234561', 'wikidata': 'https://www.wikidata.org/wiki/Q11995', 'display_name': 'Pregnancy', 'level': 2, 'score': 0.1185731}, {'id': 'https://openalex.org/C54355233', 'wikidata': 'https://www.wikidata.org/wiki/Q7162', 'display_name': 'Genetics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C170493617', 'wikidata': 'https://www.wikidata.org/wiki/Q208467', 'display_name': 'Receptor', 'level': 2, 'score': 0.0}, {'id': 'https://openalex.org/C86803240', 'wikidata': 'https://www.wikidata.org/wiki/Q420', 'display_name': 'Biology', 'level': 0, 'score': 0.0}], 'mesh': [{'descriptor_ui': 'D007234', 'descriptor_name': 'Infant, Premature', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': True}, {'descriptor_ui': 'D007334', 'descriptor_name': 'Insulin-Like Growth Factor I', 'qualifier_ui': 'Q000172', 'qualifier_name': 'deficiency', 'is_major_topic': True}, {'descriptor_ui': 'D012178', 'descriptor_name': 'Retinopathy of Prematurity', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': True}, {'descriptor_ui': 'D001724', 'descriptor_name': 'Birth Weight', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D001997', 'descriptor_name': 'Bronchopulmonary Dysplasia', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}, {'descriptor_ui': 'D001997', 'descriptor_name': 'Bronchopulmonary Dysplasia', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D001997', 'descriptor_name': 'Bronchopulmonary Dysplasia', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': False}, {'descriptor_ui': 'D002543', 'descriptor_name': 'Cerebral Hemorrhage', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D002543', 'descriptor_name': 'Cerebral Hemorrhage', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': False}, {'descriptor_ui': 'D002543', 'descriptor_name': 'Cerebral Hemorrhage', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}, {'descriptor_ui': 'D020345', 'descriptor_name': 'Enterocolitis, Necrotizing', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}, {'descriptor_ui': 'D020345', 'descriptor_name': 'Enterocolitis, Necrotizing', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': False}, {'descriptor_ui': 'D020345', 'descriptor_name': 'Enterocolitis, Necrotizing', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D005317', 'descriptor_name': 'Fetal Growth Retardation', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D005317', 'descriptor_name': 'Fetal Growth Retardation', 'qualifier_ui': 'Q000097', 'qualifier_name': 'blood', 'is_major_topic': False}, {'descriptor_ui': 'D005865', 'descriptor_name': 'Gestational Age', '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': 'D007231', 'descriptor_name': 'Infant, Newborn', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D007234', 'descriptor_name': 'Infant, Premature', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D007334', 'descriptor_name': 'Insulin-Like Growth Factor I', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D007334', 'descriptor_name': 'Insulin-Like Growth Factor I', 'qualifier_ui': 'Q000032', 'qualifier_name': 'analysis', 'is_major_topic': False}, {'descriptor_ui': 'D008137', 'descriptor_name': 'Longitudinal Studies', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D011446', 'descriptor_name': 'Prospective Studies', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012178', 'descriptor_name': 'Retinopathy of Prematurity', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}, {'descriptor_ui': 'D012178', 'descriptor_name': 'Retinopathy of Prematurity', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012307', 'descriptor_name': 'Risk Factors', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012720', 'descriptor_name': 'Severity of Illness Index', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D013548', 'descriptor_name': 'Sweden', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D013548', 'descriptor_name': 'Sweden', 'qualifier_ui': 'Q000453', 'qualifier_name': 'epidemiology', 'is_major_topic': False}], 'locations_count': 2, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1542/peds.112.5.1016', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S77494981', 'display_name': 'PEDIATRICS', 'issn_l': '0031-4005', 'issn': ['0031-4005', '1098-4275'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310315734', 'host_organization_name': 'American Academy of Pediatrics', 'host_organization_lineage': ['https://openalex.org/P4310315734'], 'host_organization_lineage_names': ['American Academy of Pediatrics'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, {'is_oa': False, 'landing_page_url': 'https://pubmed.ncbi.nlm.nih.gov/14595040', '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': None, 'sustainable_development_goals': [{'id': 'https://metadata.un.org/sdg/3', 'score': 0.83, 'display_name': 'Good health and well-being'}], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 29, 'referenced_works': ['https://openalex.org/W116867690', 'https://openalex.org/W1562028693', 'https://openalex.org/W1572297871', 'https://openalex.org/W1964027376', 'https://openalex.org/W1971449350', 'https://openalex.org/W1986451038', 'https://openalex.org/W1986734640', 'https://openalex.org/W2017170181', 'https://openalex.org/W2017949036', 'https://openalex.org/W2019675361', 'https://openalex.org/W2023633786', 'https://openalex.org/W2040089943', 'https://openalex.org/W2049021527', 'https://openalex.org/W2050040073', 'https://openalex.org/W2051353958', 'https://openalex.org/W2055696255', 'https://openalex.org/W2107609724', 'https://openalex.org/W2109105915', 'https://openalex.org/W2115073960', 'https://openalex.org/W2132422110', 'https://openalex.org/W2141370327', 'https://openalex.org/W2153259848', 'https://openalex.org/W2160243938', 'https://openalex.org/W2327878348', 'https://openalex.org/W2592080361', 'https://openalex.org/W2592477740', 'https://openalex.org/W4235284683', 'https://openalex.org/W4241017450', 'https://openalex.org/W4251311059'], 'related_works': ['https://openalex.org/W4283028363', 'https://openalex.org/W4253061985', 'https://openalex.org/W415308517', 'https://openalex.org/W3211297606', 'https://openalex.org/W3151930227', 'https://openalex.org/W2908563763', 'https://openalex.org/W2891011641', 'https://openalex.org/W2603361761', 'https://openalex.org/W2047100640', 'https://openalex.org/W2012070424'], 'abstract_inverted_index': {'Objective.': [0], 'Insulin-like': [1], 'growth': [2], 'factor': [3, 44], 'I': [4], '(IGF-I)': [5], 'is': [6, 24, 281], 'necessary': [7], 'for': [8, 45, 77, 169, 176, 184, 229, 290], 'normal': [9], 'development': [10, 102, 272], 'of': [11, 21, 82, 103, 142, 151, 191, 207, 263, 273, 278, 288], 'retinal': [12, 29], 'blood': [13], 'vessels': [14], 'in': [15, 37, 59, 194], 'mice': [16], 'and': [17, 79, 90, 132, 179, 221, 275, 297], 'humans.': [18], 'Because': [19], 'retinopathy': [20], 'prematurity': [22], '(ROP)': [23], 'initiated': [25], 'by': [26, 210], 'abnormal': [27], 'postnatal': [28], 'development,': [30], 'we': [31], 'hypothesized': [32], 'that': [33, 258], 'prolonged': [34], 'low': [35, 143, 223, 260], 'IGF-I': [36, 56, 97, 107, 144, 159, 196, 224, 245, 264, 280], 'premature': [38, 61, 266], 'infants': [39, 62], 'might': [40], 'be': [41], 'a': [42, 50, 286], 'risk': [43, 206, 228, 289], 'ROP.': [46, 104, 139, 152, 186], 'Design.': [47], 'We': [48], 'conducted': [49], 'prospective,': [51], 'longitudinal': [52], 'study': [53], 'measuring': [54], 'serum': [55, 96, 158, 261], 'concentrations': [57, 262], 'weekly': [58], '84': [60], 'from': [63, 71, 155], 'birth': [64, 156, 267, 296, 298], '(postmenstrual': [65], 'ages:': [66], '24–32': [67], 'weeks)': [68], 'until': [69, 157], 'discharge': [70], 'the': [72, 149, 205], 'hospital.': [73], 'Infants': [74], 'were': [75, 217], 'evaluated': [76], 'ROP': [78, 120, 209, 220, 274, 291], 'other': [80, 276], 'morbidity': [81, 231], 'prematurity:': [83], 'bronchopulmonary': [84], 'dysplasia': [85], '(BPD),': [86], 'intraventricular': [87], 'hemorrhage': [88], '(IVH),': [89], 'necrotizing': [91], 'enterocolitis': [92], '(NEC).': [93], 'Results.': [94], 'Low': [95], 'values': [98], 'correlated': [99, 146, 218], 'with': [100, 118, 129, 137, 148, 219, 222, 270], 'later': [101, 271], 'The': [105, 140, 153, 226], 'mean': [106, 195], '±': [108, 122, 126, 134, 166, 173, 181], 'SEM': [109], 'level': [110], 'during': [111, 197], 'postmenstrual': [112, 198, 252, 293], 'ages': [113, 199], '30–33': [114], 'weeks': [115, 203], 'was': [116, 164, 237, 246], 'lowest': [117], 'severe': [119, 185], '(25': [121], '2.41': [123], 'μg/L),': [124], '29': [125], '1.76': [127], 'μg/L': [128, 136, 163, 193, 248], 'moderate': [130, 177], 'ROP,': [131, 171, 178], '33': [133, 202, 250], '1.72': [135], 'no': [138, 170], 'duration': [141], 'also': [145], 'strongly': [147], 'severity': [150], 'interval': [154], 'levels': [160], 'reached': [161], '>33': [162], '23': [165], '2.6': [167], 'days': [168, 175, 183], '44': [172], '4.8': [174], '52': [180], '7.5': [182], 'Each': [187], 'adjusted': [188], 'stepwise': [189], 'increase': [190], '5': [192], '30': [200], 'to': [201], 'decreased': [204], 'proliferative': [208], '45%.': [211], 'Other': [212], 'complications': [213, 277], '(NEC,': [214], 'BPD,': [215, 233], 'IVH)': [216], 'levels.': [225], 'relative': [227], 'any': [230], '(ROP,': [232], 'IVH,': [234], 'or': [235], 'NEC)': [236], 'increased': [238], '2.2-fold': [239], '(95%': [240], 'confidence': [241], 'interval:': [242], '1.41–3.43)': [243], 'if': [244], '≤33': [247], 'at': [249, 282, 295], 'weeks’': [251], 'age.': [253], 'Conclusions.': [254], 'These': [255], 'results': [256], 'indicate': [257], 'persistent': [259], 'after': [265], 'are': [268], 'associated': [269], 'prematurity.': [279], 'least': [283], 'as': [284, 292], 'strong': [285], 'determinant': [287], 'age': [294], 'weight.': [299]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2064147974', 'counts_by_year': [{'year': 2024, 'cited_by_count': 19}, {'year': 2023, 'cited_by_count': 22}, {'year': 2022, 'cited_by_count': 28}, {'year': 2021, 'cited_by_count': 31}, {'year': 2020, 'cited_by_count': 22}, {'year': 2019, 'cited_by_count': 28}, {'year': 2018, 'cited_by_count': 32}, {'year': 2017, 'cited_by_count': 28}, {'year': 2016, 'cited_by_count': 32}, {'year': 2015, 'cited_by_count': 23}, {'year': 2014, 'cited_by_count': 17}, {'year': 2013, 'cited_by_count': 31}, {'year': 2012, 'cited_by_count': 24}], 'updated_date': '2024-12-11T09:21:54.992227', 'created_date': '2016-06-24'}