Database : MEDLINE
Search on : magnetic and resonance and imaging [Words]
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[PMID]: 29524719
[Au] Autor:Lv N; Tang H; Chen S; Wang X; Fang Y; Karmonik C; Huang Q; Liu J
[Ad] Address:Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China.
[Ti] Title:Morphological Parameters Related to Aneurysmal Wall Enhancement in Patients with Multiple Intracranial Aneurysms.
[So] Source:World Neurosurg;, 2018 Mar 07.
[Is] ISSN:1878-8769
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:OBJECTIVE: Vessel wall magnetic resonance imaging (MRI) has been suggested as a potential in vivo method to detect inflammation of aneurysm wall and identify unruptured intracranial aneurysm (UIA) with high rupture risk. This study aims to investigate the correlation between aneurysm wall enhancement (AWE) on vessel wall MRI and rupture-related morphological parameters in patients with multiple UIAs. METHODS: Clinical data and VW-MRI images were reviewed in 14 patients with 30 multiple UIAs. The AWE was defined as enhancement of the aneurysm wall in post-contrast vessel wall images using the pre-contrast image as reference. Morphological parameters, including aneurysm size, aspect ratio (AR), size ratio (SR), bottleneck factor (BNF), height-to-width ratio (HW), nonsphericity index (NSI) and inflow angle (IFA) were measured using 3-dimensional rotation angiography. Univariate and multivariate analysis were performed to reveal the correlation between morphological parameters and the presence of AWE. RESULTS: Sixteen of the 30 multiple UIAs presented with AWE on vessel wall MRI images. UIAs with AWE were proven to have a significantly larger size (P=0.001), AR (P=0.047), SR (P=0.003), BNF (P=0.007) and NSI (P=0.007) in univariate analysis. Further multivariate logistic regression showed that aneurysm size [odds ratio (OR)=3.54; 95% confidence interval (CI)=1.10-11.35; P=0.033] and NSI (OR=3.53; 95% CI=1.06-11.80; P=0.040) were independently associated with the presence of AWE in multiple UIAs. CONCLUSION: The presence of AWE on vessel wall MRI was significantly correlated with conventional morphological rupture risk factors in patients with multiple UIAs, which might indicate AWE as a potential radiological predictor for UIAs with high rupture risk.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  2 / 470241 MEDLINE  
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[PMID]: 29524713
[Au] Autor:Aoun SG; Bedros N; El Ahmadieh TY; Kreck J; Mehta N; Al Tamimi M
[Ti] Title:Osteodiscitis of the Lumbar Spine Due To a Migrated Fractured Inferior Vena Cava Filter: Case Report.
[So] Source:World Neurosurg;, 2018 Mar 07.
[Is] ISSN:1878-8769
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:BACKGROUND: Venous thromboembolism can be a significant cause of morbidity in the trauma population. Medical and surgical specialties have been pushing the indication for prophylactic filter placement. CASE DESCRIPTION: A 36-year-old man presented with axial lower back pain with a radicular right L2 component after lifting a heavy object. He had a history of penetrating brain trauma 3 years prior, with placement of a prophylactic inferior vena cava filter. His x-ray, computed tomography, and magnetic resonance imaging of the lumbar spine showed fracture of his filter, with migration of the fractured fragment through the inferior vena cava and into the L2-L3 disc space, and surrounding bony lysis and severe osteodiscitis. He was treated medically with intravenous and then oral antibiotics and improved clinically and radiographically. CONCLUSIONS: Conservative use of filter devices and early retrieval once their indication expires is paramount to avoid unnecessary complications.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  3 / 470241 MEDLINE  
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[PMID]: 29524707
[Au] Autor:Nishimura F; Park YS; Motoyama Y; Nakagawa I; Yamada S; Nakase H
[Ad] Address:Department of Neurosurgery, Nara Medical University, Nara, Japan. Electronic address: fnishi@naramed-u.ac.jp.
[Ti] Title:Pediatric case of xanthogranuloma in sellar region presenting visual disturbance successfully treated by endoscopic endonasal surgery.
[So] Source:World Neurosurg;, 2018 Mar 07.
[Is] ISSN:1878-8769
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:BACKGROUND: Xanthomatous pituitary diseases rarely occur in childhood. We report a rare pediatric case of a xanthogranuloma that developed in the sellar region resulting in visual disturbance that was successfully treated by endoscopic endonasal surgery. CASE DESCRIPTIONS: A 13-year-old boy came to us with a headache and visual disturbance that had occurred 1 month prior. Clinical examination findings showed that he was alert with signs of bitemporal hemianopsia, an endocrinological examination showed partial hypopituitarism, and brain magnetic resonance imaging (MRI) revealed a cystic mass in the sellar turcica compressing the optic apparatus. Endoscopic endonasal surgery was performed to decompress the optic apparatus and the mass was removed. Histopathological analysis of the tumor demonstrated granulomatous tissue with cholesterol clefts, foamy macrophages, and multinucleated giant cells, with no epithelial component. The diagnosis was xanthogranuloma of the sellar region. The patient gradually recovered from visual disturbance and was free from any neurological symptom 6 months after surgery. CONCLUSIONS: Xanthogranuloma, although rare, should be considered as a differential diagnosis of a sellar/suprasellar lesion even in children.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  4 / 470241 MEDLINE  
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[PMID]: 29524700
[Au] Autor:Tykocki T; du Plessis J; Wynne-Jones G
[Ad] Address:Department of Musculoskeletal, Spinal Unit, Royal Victoria Infirmary,Newcastle upon Tyne, UK. Electronic address: ttykocki@gmail.com.
[Ti] Title:Analysis of morphometric parameters in cervical canal stenosis on neutral and dynamic magnetic resonance imaging.
[So] Source:World Neurosurg;, 2018 Mar 07.
[Is] ISSN:1878-8769
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:OBJECTIVE: A dynamic compression injury of the cervical spinal cord is widely accepted in the pathophysiology of cervical myelopathy. Flexion/extension MRI provides information on the dynamic cervical injury. To compare morphometric parameters on neutral, flexion/extension MRI in cervical spondylotic myelopathy METHODS: Patients with cervical canal stenosis who had MRI in neutral, flexion and extension positions were retrospectively reviewed. A morphometric comparison of following parameters at compression level was performed: Spinal cord (SC) area, cerebrospinal fluid (CSF) area, CSF reserve ratio (CSF/CSF plus SC). Patients were classified according to the presence of high signal (HS) in SC and predictors of HS were calculated using logistic regression analysis. RESULTS: 55 patients, 26 men; with mean age of 57±13 were analysed. Significant difference was found in mean CSF reserve ratio between flexion and extension (0.47±0.18 vs. 0.41±0,21 p<0.05). SC area was significantly smaller in flexion (58.8±13.3 mm2) than in both neutral (66.9±22.3mm2) and extension (68.3±19.1 mm2). HS was found in 22 cases and predictors of HS were smaller SC area on extension (OR 1,46; 95%CI 1,07-1,84) and smaller CSF plus SC area on flexion (OR 1,32; 95%CI 1,06-1,45). Cut off values on ROC curve were 55mm2 for SC and 99mm2 for CSF plus SC area. CONCLUSIONS: Application of dynamic MRI in cervical stenosis reveals significant differences of both SC and CSF reserve ratio in flexion/extension and neutral positions. Patients with smaller SC area in extension and smaller CSF plus SC area in flexion have higher risk of HS on MRI.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  5 / 470241 MEDLINE  
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[PMID]: 29524643
[Au] Autor:Onishi O; Ikoma K; Oda R; Yamazaki T; Fujiwara H; Yamada S; Tanaka M; Kubo T
[Ad] Address:Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 602-8566 465, Kajiicho, Kamigyo-ku Kyoto-shi, Kyoto, Japan. Electronic address: pni_oki@yahoo.co.jp.
[Ti] Title:Sequential Variation in Brain Functional Magnetic Resonance Imaging After Peripheral Nerve Injury: A Rat Study.
[So] Source:Neurosci Lett;, 2018 Mar 07.
[Is] ISSN:1872-7972
[Cp] Country of publication:Ireland
[La] Language:eng
[Ab] Abstract:Although treatment protocols are available, patients experience both acute neuropathic pain and chronic neuropathic pain, hyperalgesia, and allodynia after peripheral nerve injury. The purpose of this study was to identify the brain regions activated after peripheral nerve injury using functional magnetic resonance imaging (fMRI) sequentially and assess the relevance of the imaging results using histological findings. To model peripheral nerve injury in male Sprague-Dawley rats, the right sciatic nerve was crushed using an aneurysm clip, under general anesthesia. We used a 7.04T MRI system. T weighted image, coronal slice, repetition time, 7 ms; echo time, 3.3 ms; field of view, 30 mm × 30 mm; pixel matrix, 64 × 64 by zero-filling; slice thickness, 2 mm; numbers of slices, 9; numbers of average, 2; and flip angle, 8 degrees. fMR images were acquired during electrical stimulation to the rat's foot sole; after 90 min, c-Fos immunohistochemical staining of the brain was performed in rats with induced peripheral nerve injury for 3, 6, and 9 weeks. Data were pre-processed by realignment in the Statistical Parametric Mapping 8 software. A General Linear Model first level analysis was used to obtain T-values. One week after the injury, significant changes were detected in the cingulate cortex, insular cortex, amygdala, and basal ganglia; at 6 weeks, the brain regions with significant changes in signal density were contracted; at 9 weeks, the amygdala and hippocampus showed activation. Histological findings of the rat brain supported the fMRI findings. We detected sequential activation in the rat brain using fMRI after sciatic nerve injury. Many brain regions were activated during the acute stage of peripheral nerve injury. Conversely, during the chronic stage, activation of the amygdala and hippocampus may be related to chronic-stage hyperalgesia, allodynia, and chronic neuropathic pain.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  6 / 470241 MEDLINE  
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[PMID]: 29524639
[Au] Autor:Zhang Z; Zhang D; Wang Z; Li J; Lin Y; Chang S; Huang R; Liu M
[Ad] Address:Center for the Study of Applied Psychology, Key Laboratory of Mental Health and Cognitive Science of Guangdong Province, School of Psychology, South China Normal University, Guangzhou, China; Department of Special Education and Communication Disorders, University of Nebraska, Lincoln, 68583, United
[Ti] Title:Intrinsic neural linkage between primary visual area and default mode network in human brain: Evidence from visual mental imagery.
[So] Source:Neuroscience;, 2018 Mar 07.
[Is] ISSN:1873-7544
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Previous studies have reported the essence of the sensory-based properties of human brain function, in which mental imagery is of great importance. In this study, we explored the association between the activities of two special regions, i.e., the primary visual area (PVA), which is the classically dominant sensory region, and the default mode network (DMN), which is the classical supra-sensory region, with a focus on their linkage in visual mental imagery. For this purpose, we collected fMRI data from 30 healthy participants (15 males; 22.37 ± 2.52 years) during the resting state and a mental rotation task state. By using a critical time point analysis (CTPA), we investigated the association between the activities of the PVA and the DMN. As the results showed, there existed a PVA-related (i.e., prefrontal cortex, DMN, sensorimotor areas and medial temporal lobe) and a DMN-related neural association pattern (i.e., PVA, prefrontal cortex and the medial temporal lobe) in the human brain. Furthermore, the results showed the steady and tight intrinsic association between the activities of the PVA and the DMN, with the prefrontal cortex and the medial temporal lobe regions being found to be consistently involved in the resting state brain. It also was suggested that the observed association between the PVA and the DMN was highly reproducible for the mental rotation task. Together, these observations, from the perspective of visual mental imagery, provided experimental evidence for the robustness and stability of the detailed map of the associations between the activities of the PVA and the DMN.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  7 / 470241 MEDLINE  
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[PMID]: 29524624
[Au] Autor:Varol E; Sotiras A; Davatzikos C
[Ad] Address:Section for Biomedical Image Analysis, Center for Biomedical Image Computing and Analytics, University of Pennsylvania, Philadelphia, PA, 19104, USA. Electronic address: erdem.varol@uphs.upenn.edu.
[Ti] Title:MIDAS: Regionally linear multivariate discriminative statistical mapping.
[So] Source:Neuroimage;, 2018 Mar 07.
[Is] ISSN:1095-9572
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Statistical parametric maps formed via voxel-wise mass-univariate tests, such as the general linear model, are commonly used to test hypotheses about regionally specific effects in neuroimaging cross-sectional studies where each subject is represented by a single image. Despite being informative, these techniques remain limited as they ignore multivariate relationships in the data. Most importantly, the commonly employed local Gaussian smoothing, which is important for accounting for registration errors and making the data follow Gaussian distributions, is usually chosen in an ad hoc fashion. Thus, it is often suboptimal for the task of detecting group differences and correlations with non-imaging variables. Information mapping techniques, such as searchlight, which use pattern classifiers to exploit multivariate information and obtain more powerful statistical maps, have become increasingly popular in recent years. However, existing methods may lead to important interpretation errors in practice (i.e., misidentifying a cluster as informative, or failing to detect truly informative voxels), while often being computationally expensive. To address these issues, we introduce a novel efficient multivariate statistical framework for cross-sectional studies, termed MIDAS, seeking highly sensitive and specific voxel-wise brain maps, while leveraging the power of regional discriminant analysis. In MIDAS, locally linear discriminative learning is applied to estimate the pattern that best discriminates between two groups, or predicts a variable of interest. This pattern is equivalent to local filtering by an optimal kernel whose coefficients are the weights of the linear discriminant. By composing information from all neighborhoods that contain a given voxel, MIDAS produces a statistic that collectively reflects the contribution of the voxel to the regional classifiers as well as the discriminative power of the classifiers. Critically, MIDAS efficiently assesses the statistical significance of the derived statistic by analytically approximating its null distribution without the need for computationally expensive permutation tests. The proposed framework was extensively validated using simulated atrophy in structural magnetic resonance imaging (MRI) and further tested using data from a task-based functional MRI study as well as a structural MRI study of cognitive performance. The performance of the proposed framework was evaluated against standard voxel-wise general linear models and other information mapping methods. The experimental results showed that MIDAS achieves relatively higher sensitivity and specificity in detecting group differences. Together, our results demonstrate the potential of the proposed approach to efficiently map effects of interest in both structural and functional data.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  8 / 470241 MEDLINE  
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[PMID]: 29520189
[Au] Autor:Yi J; Lee YH; Song HT; Suh JS
[Ad] Address:Department of Radiology, Research Institute of Radiological Science, YUHS-KRIBB Medical Convergence Research Institute, and Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul 03722, Korea.
[Ti] Title:Clinical Feasibility of Synthetic Magnetic Resonance Imaging in the Diagnosis of Internal Derangements of the Knee.
[So] Source:Korean J Radiol;19(2):311-319, 2018 Mar-Apr.
[Is] ISSN:2005-8330
[Cp] Country of publication:Korea (South)
[La] Language:eng
[Ab] Abstract:Objective: To evaluate the feasibility of synthetic magnetic resonance imaging (MRI) compared to conventional MRI for the diagnosis of internal derangements of the knee at 3T. Materials and Methods: Following Institutional Review Board approval, image sets of conventional and synthetic MRI in 39 patients were included. Two musculoskeletal radiologists compared the image sets and qualitatively analyzed the images. Subjective image quality was assessed using a four-grade scale. Interobserver agreement and intersequence agreement between conventional and synthetic images for cartilage lesions, tears of the cruciate ligament, and tears of the meniscus were independently assessed using Kappa statistics. In patients who underwent arthroscopy (n = 8), the sensitivity, specificity, and accuracy for evaluated internal structures were calculated using arthroscopic findings as the gold standard. Results: There was no statistically significant difference in image quality ( = 0.90). Interobserver agreement (κ = 0.649- 0.981) and intersequence agreement (κ = 0.794-0.938) were nearly perfect for all evaluated structures. The sensitivity, specificity, and accuracy for detecting cartilage lesions (sensitivity, 63.6% vs. 54.6-63.6%; specificity, 91.9% vs. 91.9%; accuracy, 83.3-85.4% vs. 83.3-85.4%) and tears of the cruciate ligament (sensitivity, specificity, accuracy, 100% vs. 100%) and meniscus (sensitivity, 50.0-62.5% vs. 62.5%; specificity, 100% vs. 87.5-100%; accuracy, 83.3-85.4% vs. 83.3-85.4%) were similar between the two MRI methods. Conclusion: Conventional and synthetic MRI showed substantial to almost perfect degree of agreement for the assessment of internal derangement of knee joints. Synthetic MRI may be feasible in the diagnosis of internal derangements of the knee.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.3348/kjr.2018.19.2.311

  9 / 470241 MEDLINE  
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[PMID]: 29520190
[Au] Autor:Lee H; Ahn JM; Kang Y; Oh JH; Lee E; Lee JW; Kang HS
[Ad] Address:Department of Radiology, Kyungpook National University Hospital, Daegu 41944, Korea.
[Ti] Title:Evaluation of the Subscapularis Tendon Tears on 3T Magnetic Resonance Arthrography: Comparison of Diagnostic Performance of T1-Weighted Spectral Presaturation with Inversion-Recovery and T2-Weighted Turbo Spin-Echo Sequences.
[So] Source:Korean J Radiol;19(2):320-327, 2018 Mar-Apr.
[Is] ISSN:2005-8330
[Cp] Country of publication:Korea (South)
[La] Language:eng
[Ab] Abstract:Objective: To compare the T1-weighted spectral presaturation with inversion-recovery sequences (T1 SPIR) with T2-weighted turbo spin-echo sequences (T2 TSE) on 3T magnetic resonance arthrography (MRA) in the evaluation of the subscapularis (SSC) tendon tear with arthroscopic findings as the reference standard. Materials and Methods: This retrospective study included 120 consecutive patients who had undergone MRA within 3 months between April and December 2015. Two musculoskeletal radiologists blinded to the arthroscopic results evaluated T1 SPIR and T2 TSE images in separate sessions for the integrity of the SSC tendon, examining normal/articular-surface partial-thickness tear (PTTa)/full-thickness tear (FTT). Diagnostic performance of T1 SPIR and T2 TSE was calculated with arthroscopic results as the reference standard, and sensitivity, specificity, and accuracy were compared using the McNemar test. Interobserver agreement was measured with kappa (κ) statistics. Results: There were 74 SSC tendon tears (36 PTTa and 38 FTT) confirmed by arthroscopy. Significant differences were found in the sensitivity and accuracy between T1 SPIR and T2 TSE using the McNemar test, with respective rates of 95.9-94.6% vs. 71.6-75.7% and 90.8-91.7% vs. 79.2-83.3% for detecting tear; 55.3% vs. 31.6-34.2% and 85.8% vs. 78.3-79.2%, respectively, for FTT; and 91.7-97.2% vs. 58.3-61.1% and 89% vs. 78-79.3%, respectively, for PTTa. Interobserver agreement for T1 SPIR was almost perfect for T1 SPIR (κ = 0.839) and substantial for T2 TSE (κ = 0.769). Conclusion: T1-weighted spectral presaturation with inversion-recovery sequences is more sensitive and accurate compared to T2 TSE in detecting SSC tendon tear on 3T MRA.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.3348/kjr.2018.19.2.320

  10 / 470241 MEDLINE  
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[PMID]: 29520187
[Au] Autor:Zhang GY; Zhu HX; Li EM; Shi H; Liu W; Zheng L; Bai ZW; Ding HY
[Ad] Address:Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital of Shandong University, Jinan 250014, China.
[Ti] Title:The Correlation between the Injury Patterns of the Medial Patellofemoral Ligament in an Acute First-Time Lateral Patellar Dislocation on MR Imaging and the Incidence of a Second-Time Lateral Patellar Dislocation.
[So] Source:Korean J Radiol;19(2):292-300, 2018 Mar-Apr.
[Is] ISSN:2005-8330
[Cp] Country of publication:Korea (South)
[La] Language:eng
[Ab] Abstract:Objective: To evaluate the correlation between the injury patterns of the medial patellofemoral ligament (MPFL) on magnetic resonance imaging in an acute first-time lateral patellar dislocation (LPD) and incidence of a second-time LPD. Materials and Methods: Magnetic resonance images were prospectively analyzed in 147 patients after an acute first-time LPD with identical nonoperative management. The injury patterns of MPFL in acute first-time LPDs were grouped by location and severity for the analysis of the incidence of second-time LPD in a 5-year follow-up. Independent tests, chi-square tests and Kruskal-Wallis tests were performed as appropriate. Results: Forty-six cases (46/147, 31.3%) of second-time LPD were present at the 5-year follow-up. Fourteen (14/62, 22.6%) and 31 cases (31/80, 38.8%) were present in the partial and complete MPFL tear subgroups, respectively. Twenty-five cases (25/65, 38.5%), 11 cases (11/26, 42.3%), and 8 cases (8/47, 17%) were present in the isolated femoral-side MPFL tear (FEM), combined MPFL tear (COM), and isolated patellar-side MPFL tear (PAT) subgroups, respectively. Compared with the partial MPFL tears, complete tears showed higher incidence of a second-time LPD ( = 0.04). The time interval between the two LPDs was shorter in the complete MPFL tear subgroup (24.2 months) than in the partial tear subgroup (36.9 months, = 0.001). Compared with the PAT subgroup, the FEM and COM subgroups showed a higher incidence of a second-time LPD ( = 0.025). The time intervals between the two LPDs were shorter in the FEM and COM subgroups (20.8 months and 19.2 months) than in the PAT subgroup (32.5 months, = 0.049). Conclusion: A complete MPFL tear, isolated femoral-side tear and combined tear in a first-time LPD predispose a second-time LPD.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.3348/kjr.2018.19.2.292


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