Emilio González Martínez, Giancarlo Mattos-Piaggio, David Santamarta Gómez
{"title":"Review of therapeutic failures of microvascular decompression in trigeminal neuralgia at a tertiary hospital.","authors":"Emilio González Martínez, Giancarlo Mattos-Piaggio, David Santamarta Gómez","doi":"10.1016/j.neucie.2024.10.004","DOIUrl":"10.1016/j.neucie.2024.10.004","url":null,"abstract":"<p><strong>Introduction: </strong>Microvascular decompression (MVD) is a non-ablative technique aimed at relieving pain in trigeminal neuralgia (TN) by resolving a neurovascular conflict. Despite reported high success rates, a significant percentage of patients experience therapeutic failure.</p><p><strong>Methods: </strong>Retrospective observational study of patients with suspected TN undergoing MVD was performed with the goal of identifying factors contributing to the persistence and recurrence of pain.</p><p><strong>Results: </strong>In the present study, 31 patients undergoing 38 MVD procedures for TN were included (7 patients underwent reoperation after the failure of the initial operation). The mean age was 58.5 years with a male predominance (58.1%). The mean duration of pain was 6.4 years, mainly affecting branches V2 and V3 (46.7%). The most frequently described neurovascular conflict was with the superior cerebellar artery (54.8%), predominantly resolved with Teflon (75.9%). In our case series, MVD achieved pain control in 80.6% of patients at one-year post-intervention and 61.3% at the end of the follow-up period. Twelve patients experienced MVD failure: 5 cases of persistent pain and 7 cases of pain recurrence. A detailed analysis of these failures identified misdiagnosis as the reason of persistent pain in 4 patients, while inadequate surgical technique could be the cause of pain recurrence in 6 patients.</p><p><strong>Conclusion: </strong>In our study, therapeutic failures could mainly be attributed to two factors: misdiagnosis or the use of inappropriate materials. These factors should be considered when optimizing the management of DMV in patients with NT.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ana Irigaray Echarri, M Dolores Ollero García-Agulló, José Jorge Ortez Toro, Idoya Zazpe Cenoz
{"title":"Endothelial dysfunction and vascular abnormalities in acromegaly. A case report.","authors":"Ana Irigaray Echarri, M Dolores Ollero García-Agulló, José Jorge Ortez Toro, Idoya Zazpe Cenoz","doi":"10.1016/j.neucie.2024.10.005","DOIUrl":"10.1016/j.neucie.2024.10.005","url":null,"abstract":"<p><p>In patients with acromegaly, the pleiotropic effects of GH and IGF-1 have been associated with the development of endothelial dysfunction and vascular abnormalities. We present the case of a 45-year-old male diagnosed with acromegaly. Magnetic resonance imaging identified a marked dilatation and medialization of both cavernous internal carotid arteries (ICA), leading to a narrow intercarotid distance, a phenomenon known as \"carotid kisses\". This vascular alteration has been described in greater proportion in patients with acromegaly. The anomalies that are also present with greater prevalence in these patients are: aneurysms of the ICA, protrusion of the ICA into the sphenoid sinus, narrow intercarotid distance, fusiform dilatation of the ICA and dehiscence of this artery in the bony canal. The presence of such alterations increases the risk of injury to the ICA. Pre-surgical detection of such abnormalities is essential to ensure the safety of the surgical approach.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antonio José Vargas López, Gador Ramos Bosquet, Carlos Fernández Carballal
{"title":"Proposal for a complementary surgical checklist for brain tumor surgery.","authors":"Antonio José Vargas López, Gador Ramos Bosquet, Carlos Fernández Carballal","doi":"10.1016/j.neucie.2024.10.002","DOIUrl":"10.1016/j.neucie.2024.10.002","url":null,"abstract":"<p><strong>Background and objective: </strong>Once the WHO generic surgical checklist has been standardized and following the itinerary proposed, it is up to the different specialties to continue advancing in the improvement and adjustment of the checklists to the procedures and interventions in their field.</p><p><strong>Methods: </strong>Through a Failure Mode and Effects Analysis (FMEA) in which professionals from the surgical area of the Torrecárdenas University Hospital, Jaén Hospital Complex and Gregorio Marañón General University Hospital participated, aspects that could condition patient safety in the surgery of the brain tumors and that are not included in the WHO generic surgical checklist were recognized. The three authors gave a score between 1 and 5 to each of the proposed items incrementally depending on the degree of suitability. Based on the score obtained, they selected those who would be incorporated into the specific surgical checklist.</p><p><strong>Results: </strong>A total of 24 candidate items were identified to be included in the specific check list. These obtained scores between 14 and 10 points. After this weighting, it was decided to include the 12 best-rated items in the final surgical checklist, six of them in the initial phase, three in the phase prior to the incision and another three in the final part of the checklist prior to the completion of the procedure.</p><p><strong>Conclusions: </strong>Professionals in the surgical area of Neurosurgery can identify aspects not included in the generic checklist whose non-compliance can condition the patient's safety at least to the same extent as those included in the generic list. It is possible to propose a specific complementary checklist for brain tumor surgery, in charge of collecting aspects related to the safety and success of these procedures.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rafael Aponte-Caballero, Julian Alfonso Sierra-Peña, Juan Felipe Abaunza-Camacho, William Mauricio Riveros-Castillo, Javier M Saavedra
{"title":"Cauda equina malignant peripheral nerve sheath tumor presenting with subarachnoid hemorrhage: a case report.","authors":"Rafael Aponte-Caballero, Julian Alfonso Sierra-Peña, Juan Felipe Abaunza-Camacho, William Mauricio Riveros-Castillo, Javier M Saavedra","doi":"10.1016/j.neucie.2024.10.001","DOIUrl":"10.1016/j.neucie.2024.10.001","url":null,"abstract":"<p><p>Malignant peripheral nerve sheath tumors (MPNST) are uncommon aggressive neoplasms, frequently associated with type I neurofibromatosis. This is the first case of intradural lumbar spine MPNST with intraoperative findings of associated subarachnoid hemorrhage (SAH). A 72-year-old man presented to the emergency department with severe acute low back pain. Neurological examination was unremarkable. Gadolinium-enhanced MRI of the lumbar spine showed an irregularly shaped intradural lesion extending from L3 to L5. The lesion exhibited a medium signal both on T1 and T2-weighted imaging with peripheral enhancement. Through an L3-L5 laminectomy, a diffuse SAH, and a tumor tightly adherent to cauda equina nerve roots were found. Specimen examination revealed a fusocelular tumor with pleomorphic and hyperchromatic nuclei, positive for S100, and SOX10. On an 8-month follow-up, he had no neurological deficit, with a Karnofsky performance score of 90 points. Surgical evidence of SAH in lumbar spine intradural MPNST is a novel finding.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142482519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Reyhan Kasab, Selcuk Yilmazlar, Oguz Altunyuva, Recep Fedakar
{"title":"Relationship between optic nerve length and interoptic angle in the prediction of optic chiasm location.","authors":"Reyhan Kasab, Selcuk Yilmazlar, Oguz Altunyuva, Recep Fedakar","doi":"10.1016/j.neucie.2024.09.005","DOIUrl":"10.1016/j.neucie.2024.09.005","url":null,"abstract":"<p><strong>Introduction and objectives: </strong>The sellar region is an area in the base of the skull that is among the most common sites for tumors of the central nervous system. Surgical interventions are currently performed via different routes. While the optic chiasm occupies its expected position in 70% of the population, it can deviate from this position. In such cases, surgery involving this region becomes more difficult as the known surgical routes are narrowed. Advance awareness of these variations can help surgeons to identify the optimal route for safe surgical intervention in the sellar region. By performing simple measurements of both the lengths of the optic nerves and the angle between them, a surgeon can predict the location of the chiasm.</p><p><strong>Materials and methods: </strong>Twenty specimens collected from autopsies performed at Bursa Forensic Medicine İnstitute were examined to determine the optic chiasm types and the relationships between the surrounding subchiasmal structures.</p><p><strong>Results: </strong>Among the 20 specimens, we found two prefixed (10%), 10 normo-fixed (50%), and eight postfixed chiasms (40%). The mean interoptic angle was 81.03 (±17.41)⁰. Prefixed chiasms had angles in the range 115.36°-124.76 ° (mean 120.06 [±6.65]⁰), normo-fixed chiasm angles were between 83.11° and 97.53 ° (mean 86.07 [±6.73]⁰), and postfixed chiasms ranged between 53.01 ° and 78.71 ° (mean 69.20 [±9.13]⁰). The length of the right optic nerve ranged between 6.95 and 13.83 mm (mean 10.25 [±1.81] mm), and the length of the left between 7.25 and 12.51 mm (mean 10.40 [±1.47] mm). Obtuse angles indicated that the chiasm was prefixed, and acute angles were indicative of a postfixed chiasm. There was a strong negative correlation between optic nerve lengths and the interoptic angle; thus, as the length of the nerves increases, the interoptic angle becomes more acute.</p><p><strong>Conclusions: </strong>We have proposed a simple measurement of the optic nerve lengths and the angle between them to predict the relative location of the OC, which can be done easily on MRI.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142376395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Mortality risk factors for adult trauma patients treated with halo brace for cervical spine fracture.","authors":"Kim Hoang, Jeffrey Santos, Areg Grigorian, Lourdes Swentek, Hansen Bow, Jeffry Nahmias","doi":"10.1016/j.neucie.2024.09.003","DOIUrl":"10.1016/j.neucie.2024.09.003","url":null,"abstract":"<p><strong>Introduction and objectives: </strong>Halo braces treat upper cervical spine fractures and serve as the most rigid form of external immobilization. Recently, halo braces have lost favor due to known complications and advances in surgical stabilization. This study aims to determine the contemporary incidence for use of halo braces and identify risk factors associated with mortality in trauma patients undergoing halo brace for cervical spine fractures.</p><p><strong>Materials and methods: </strong>The 2017-2019 Trauma Quality Improvement Program Database was queried for patients ≥18 years-old with a cervical spine fracture undergoing halo brace. Patients sustaining penetrating trauma and severe torso injuries (abbreviated injury scale >3 for the abdomen or thorax) were excluded. Bivariate and multivariable logistic regression analyses were performed.</p><p><strong>Results: </strong>From 144,434 patients with a cervical spine fracture, 272 (0.2%) underwent halo brace and 14 (5%) of these died. Those who died were older (73.5 vs. 53 years-old, p = 0.011) and had higher rates of hypertension (78.6% vs 33.1%, p < 0.001) and chronic kidney disease (14.3% vs. 1.2%, p < 0.001). Glasgow Coma Scale ≤8 (46.2% vs. 8.2%, p < 0.001) and cervical spinal cord injury (71.4% vs. 21.3%, p < 0.001) were more common in patients who died. In addition, those who died more often sustained respiratory complications (7.1% vs. 0.4%, p = 0.004) and sepsis (7.1% vs. 0.4%, p = 0.004). On multivariable logistic regression analysis, only Glasgow Coma Scale ≤8 (OR 19.77, 3.04-128.45, p = 0.002) was associated with increased mortality.</p><p><strong>Conclusions: </strong>Only 5% of cervical spine fracture patients undergoing halo brace died. Respiratory complications and sepsis were more common in those who died. On multivariable analysis only Glasgow Coma Scale ≤8 remained an independent associated risk factor for mortality.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142367752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sergio García García, Ignacio Arrese Regañón, Santiago Cepeda Chafla, Rosario Sarabia Herrero
{"title":"Endovascular treatment of chronic subdural hematoma in a dual-trained neurosurgical unit: Results and proposal of a randomized controlled trial protocol.","authors":"Sergio García García, Ignacio Arrese Regañón, Santiago Cepeda Chafla, Rosario Sarabia Herrero","doi":"10.1016/j.neucie.2024.09.002","DOIUrl":"10.1016/j.neucie.2024.09.002","url":null,"abstract":"<p><strong>Introduction: </strong>Chronic subdural hematoma (cSDH) is a prevalent neurosurgical condition with an increasing incidence due to the rising life expectancy and the widespread use of anticoagulant and antiplatelet therapies. Insights into the inflammatory origins of cSDH led to the exploration of Middle Meningeal Artery (MMA) embolization as a therapeutic strategy. In recent years the endovascular treatment of MMA has gained momentum. Herein we present the initial experience of a dual trained neurovascular unit implementing this therapeutic technique.</p><p><strong>Methods: </strong>This single-center, prospective pilot study aimed to evaluate the feasibility, safety, and efficacy of MMA embolization in the treatment of cSDH. Following ethical approval and informed consent, demographic, clinical, and radiological data were collected. Patients requiring emergent surgical treatment were excluded. The study focused on assessing clinical outcomes, including the Modified Rankin Score (mRS) and volumetric analysis of cSDH, before and after embolization.</p><p><strong>Results: </strong>Fifteen patients underwent MMA embolization, with a predominance of males (80%) and a mean age of 72.4 years. The most common presenting symptom was headache (53.3%). The average hospital stay was 3.9 days. Various embolization techniques were employed, with DMSO-EVOH being the most frequent. All procedures were successfully conducted without complications. Although not statistically significant, trends suggested better outcomes in patients with homogeneous cSDH on the CT scan, displaying the cotton wool sign on angiography and treated with EVOH-DMSO.</p><p><strong>Conclusion: </strong>MMA embolization for cSDH demonstrates promise as a safe and effective treatment, potentially reducing the need for surgical intervention and recurrence rates. This study lays the groundwork for a larger, randomized controlled trial which protocol is herein presented.</p>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142302802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Partial sensory rhizotomy in recurrent trigeminal neuralgia. Our experience and literature review","authors":"","doi":"10.1016/j.neucie.2024.07.003","DOIUrl":"10.1016/j.neucie.2024.07.003","url":null,"abstract":"<div><h3>Background and objective</h3><p><span>Trigeminal Neuralgia (NT) is a common pathology in </span>Neurosurgery<span>. It can be classified as idiopathic or secondary to other pathologies, such as Multiple Sclerosis<span><span> (MS). Several surgical treatments have been described, some of them being replaced by more modern techniques. Partial sensory rhizotomy (PSR), described by Dandy is a technique replaced by other techniques due to its permanent side effects. We present our experience with this technique in patients with recurrent </span>NT.</span></span></p></div><div><h3>Methods and materials</h3><p>A retrospective review is carried out on five patients who underwent surgery at our center from 2018 to 2023 using the PSR technique.</p></div><div><h3>Results</h3><p>All the patients intervened showed significant clinical improvement, except one patient who required reintervention due to uncontrolled pain. According to the Barrow Neurological Institute (BNI) scale, 80% (4/5) of patients showed improvement from grade V to grades I/II except for one of them. This patient suffered from MS. Additionally, one patient presented a corneal ulcer<span> after surgery due to impairment of the corneal reflex.</span></p></div><div><h3>Conclusion</h3><p>In our experience, PSR is a valid treatment option in selected patients with recurrent TN. It has a low incidence of complications with an adequate surgical technique and anatomical knowledge of the region. To the best of our knowledge, we are one of the few centers in Spain to publish our results with PSR in the last ten years. We report good results in pain control withdrawing medication in 80% (4/5) of the operated patients.</p></div>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":"35 5","pages":"Pages 247-252"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141556144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gamma Knife radiosurgery for the treatment of trigeminal neuralgia: A single center-experience","authors":"","doi":"10.1016/j.neucie.2024.04.001","DOIUrl":"10.1016/j.neucie.2024.04.001","url":null,"abstract":"<div><h3>Introduction and objectives</h3><p>We aimed to assess the outcomes of patients with trigeminal neuralgia<span> (TGN) who underwent Gamma Knife radiosurgery (GKRS).</span></p></div><div><h3>Materials and methods</h3><p>Fifty-three patients with typical TGN underwent GKRS from May 2012 until December 2022. Among these patients, 45 patients who were follow-up for at least 12 months were included in the study. A mean dose of 87.5 Gy (range, 80–90) was administered to the trigeminal nerve. Postoperatively, outcome was considered excellent if the patient was pain- and medication-free.</p></div><div><h3>Results</h3><p>The mean symtpom duration was 9.53 years, and the mean patient age was 59.8 years (range, 34–85). The mean follow-up period was 46.8 months (range, 12–127 months). 46.7% of patients had a history of previous surgical interventions. A single nerve division was affected in 14 patients (31.1%), and multiple divisions were affected in 31 patients (68.9%). The rate of initial pain relief was 80%. Hypoesthesia in the area of trigeminal nerve developed in 30 (66.7%). Twenty patients (44.4%) exhibited excellent results within 72.4 months. Recurrence occurred in 11 patients (24.4%) with 27.6 months.</p></div><div><h3>Conclusions</h3><p>Our results suggest that GKRS is a safe and effective procedure. Thus, it is an attractive first- and second-line treatment choice for TGN.</p></div>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":"35 5","pages":"Pages 225-232"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140759575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Intracranial hypertension secondary to unruptured pial arteriovenous malformation. Suitability of isolated endovascular treatment with ethylene vinyl alcohol/dimethyl sulfoxide (Onyx®). Case report and literature review","authors":"","doi":"10.1016/j.neucie.2024.07.001","DOIUrl":"10.1016/j.neucie.2024.07.001","url":null,"abstract":"<div><p><span>A 36-year-old male presented to the Emergency Department<span> with clinical symptoms of blurred vision of progressive onset of two years of evolution. The ophthalmological examination revealed the existence of bilateral papilledema<span>. Using cranial computed tomography<span><span> and magnetic resonance imaging, the presence of a right occipital pial arteriovenous malformation<span> was certified. Arteriographically, pial arterial contributions dependent on the right middle cerebral artery and the right </span></span>posterior cerebral artery<span><span> were identified. Venous drainage was located at the level of the superior sagittal sinus<span>. An associated right transverse sinus stenosis was also identified. The existence of secondary </span></span>intracranial hypertension was corroborated by monitoring with an </span></span></span></span></span>intracranial pressure<span><span> sensor. An interventional procedure was carried out consisting of embolization of the </span>arterial supplies<span> of the lesion using Onyx®. The clinical-radiological findings after the procedure were favorable: the papilledema disappeared and complete exclusion of the malformation was achieved. A new intracranial pressure measurement showed resolution of intracranial hypertension. Subsequent regulated radiological controls showed complete exclusion of the malformation up to 5 years later.</span></span></p></div>","PeriodicalId":74273,"journal":{"name":"Neurocirugia (English Edition)","volume":"35 5","pages":"Pages 272-280"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141556143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}