You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["HealthCareActivity", "InjuryOrPoisoning", "BodySubstance", "IntellectualProduct", "AnatomicalStructure", "SpatialConcept", "Chemical", "Bacterium", "MedicalDevice", "Organization", "BiomedicalOccupationOrDiscipline", "Finding", "BiologicFunction", "Virus", "ResearchActivity", "ClinicalAttribute", "PopulationGroup", "Eukaryote", "BodySystem", "Food", "ProfessionalOrOccupationalGroup"].

Please return the output as a JSON object of the format: {"Virus": ["HIV", ...], "Bacterium": ["MRSA", ...], "AnatomicalStructure": ["Lung", ...], "BodySystem": ["CNS", ...], "BodySubstance": ["Serum", ...], "Finding": ["Headache", ...], "InjuryOrPoisoning": ["Fracture", ...], "BiologicFunction": ["Death", ...], "HealthCareActivity": ["Biopsy", ...], "ResearchActivity": ["Clinical trial", ...], "MedicalDevice": ["Lenses", ...], "SpatialConcept": ["Camps", ...], "BiomedicalOccupationOrDiscipline": ["Forensic medicine", ...], "Organization": ["WHO", ...], "ProfessionalOrOccupationalGroup": ["Provider", ...], "PopulationGroup": ["Swimmers", ...], "Chemical": ["Gold", ...], "Food": ["Rice", ...], "IntellectualProduct": ["RPAM", ...], "ClinicalAttribute": ["Biomarker", ...], "Eukaryote": ["Dogs", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Progressive Occlusion and Recanalization after Endovascular Treatment for 287 Unruptured Small Aneurysms (<5mm): A Single-Center 6-Year Experience We aimed to investigate the effect of coiling for small unruptured intracranial aneurysms (UIAs)﹤5mm) on progressive occlusio n and recanalization, and the dubious factors related to progressive occlusion and recanalization among UIAs without complete occlusion. A total of 264 patients with 287 small UIAs were coiled in our institute between June 2009 and December 2014. All UIAs enrolled were divided into small (3-5mm) and very small (<3mm) group s, and UIAs without initial complete occlusion were divided into progressive, stable and recanalization groups. Baseline characteristics, procedure -related complications, angiographic follow-up results, and clinical outcomes were statistically analyzed. Among 287 aneurysms, 211 aneurysms (73.5%) were completely coiled, three (1.2%) intraoperative ruptures and 12 (4.2%) perioperative thromboembolic events occurred. Angiographic follow-up was available for 174 patients (65.9%), the incidence of recanalization was 5.7%. Among 56 aneurysms without complete occlusion, 43 (76.8%) had progressive occlusion and 6(10.7%) had recanalization. Anatomic results of initial and follow-up between small and very small groups were similar in both groups. On logistic regression analysis, smaller size (<3mm) without complete occlusion related to recanalization (OR, 8.0, 95% CI, 1.3-50.0, P=0.026). Our study suggested that coil embolization of small UIAs can achieve a high rate of progressive occlusion and low rate of recanalization during follow-up. Anatomic results of initial and follow-up between small (3-5mm) and very small (<3mm) groups were similar in both groups. What's more, smaller size (<3mm) without complete occlusion may relate to recanalization.
{"AnatomicalStructure": [], "Bacterium": [], "BiologicFunction": ["aneurysms", "UIAs", "Experience", "unruptured intracranial aneurysms", "Unruptured Small Aneurysms", "complications", "thromboembolic events"], "BiomedicalOccupationOrDiscipline": [], "BodySubstance": [], "BodySystem": [], "Chemical": [], "ClinicalAttribute": [], "Eukaryote": [], "Finding": ["Anatomic results"], "Food": [], "HealthCareActivity": ["angiographic", "Angiographic", "recanalization", "Endovascular Treatment", "follow-up results", "coil embolization", "follow-up", "procedure", "Recanalization"], "InjuryOrPoisoning": ["ruptures"], "IntellectualProduct": [], "MedicalDevice": [], "Organization": ["institute", "Single-Center"], "PopulationGroup": [], "ProfessionalOrOccupationalGroup": [], "ResearchActivity": ["study"], "SpatialConcept": ["size", "coiling"], "Virus": []}