Radiation Medicine and Protection最新文献

{"title":"Dosimetry of automatic non-coplanar volumetric-modulated arc therapy for nasopharyngeal carcinoma","authors":"Kaiqiang Chen,&nbsp;Jihong Chen,&nbsp;Yanming Cheng,&nbsp;Danni Hong,&nbsp;Cairong Hu,&nbsp;Penggang Bai,&nbsp;Jinyong Lin,&nbsp;Yang Yang,&nbsp;Xiuchun Zhang","doi":"10.1016/j.radmp.2024.12.004","DOIUrl":"10.1016/j.radmp.2024.12.004","url":null,"abstract":"<div><h3>Objective</h3><div>To evaluate the dosimetric quality of radiotherapy plans for nasopharyngeal carcinoma (NPC) using HyperArc (HA) technology.</div></div><div><h3>Methods</h3><div>A retrospective analysis was conducted on 20 patients with initially diagnosed NPC who had received TomoTherapy (TOMO) treatment. Treatment plans were redesigned using HA technology on the Eclipse planning system. Dosimetric parameters and verification passing rates were collected to assess the dosimetric quality of target coverage and organ-at-risk (OAR) sparing in both sets of plans. Paired <em>t</em>-tests or Rank-Sum tests were used to compare the dosimetric parameters between the two plans.</div></div><div><h3>Results</h3><div>For the planning target volumes (PTVs), the target coverage in both plans reached 95%. Compared with the TOMO plans, the HA plans exhibited a steeper dose fall-off for PTV_69.75Gy (<em>P</em> ​&lt; ​0.05). However, the conformity index (CI) of the HA plans (0.75) was slightly lower than that of the TOMO plans (0.81, <em>P</em> ​<em>&lt;</em> ​0.05). The homogeneity index (HI) was better in the TOMO plans, with statistically significant differences for PTV_69.75Gy and PTV_55.80Gy (<em>P</em> ​&lt; ​0.05). Moreover, the HA plans had better sparing, particularly for the optic chiasm, optic nerves, and parotid glands (<em>P</em> ​&lt; ​0.05), while no statistically significant differences were observed for other critical structures such as the brainstem, spinal cord, and temporal lobes (<em>P</em> ​&gt; ​0.05). Additionally, the average beam-on time for the HA plans (252 ​s) was shorter than that of the TOMO plans (326 ​s, <em>P</em> ​&lt; ​0.05). The mean gamma passing rate at 3%/2 ​mm for all plans exceeded 98%.</div></div><div><h3>Conclusions</h3><div>Radiotherapy plans for NPC based on HA technology exhibit excellent dosimetric quality, providing good target coverage, rapid dose fall-off, and effective protection of adjacent critical organs.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"6 1","pages":"Pages 37-42"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of heat shock protein in radiation-induced effect and related potential clinical application","authors":"Ying Xu,&nbsp;Wentao Hu,&nbsp;Guangming Zhou","doi":"10.1016/j.radmp.2024.11.002","DOIUrl":"10.1016/j.radmp.2024.11.002","url":null,"abstract":"<div><div>Heat shock protein (HSP), as an intracellular chaperone, is significantly upregulated when cells are exposed to radiation and other stress environments, playing an important role in cell self-protection. This phenomenon not only provides a mechanism for normal tissues to resist radiation damage, but also provides a strategy for cancer cells to reduce their sensitivity to radiation and escape treatment. More research is needed to clarify the specific mechanism of HSP in radiotherapy and how to better use its biological effects for clinical individualized treatment. This paper reviews the biological effects of HSP under radiation and the latest research progress of combined radiation and HSP inhibitors or hyperthermia, in the hope of having a more comprehensive understanding of its mechanism in physiological processes such as cell survival, apoptosis, inflammation, immune response, as well as radiation response, which will help to enhance the therapeutic effect and to provide more effective and safer radiotherapy for cancer patients in the future.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"6 1","pages":"Pages 51-60"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expert consensus on radiotherapy for elderly patients with esophageal cancer in China (2024 edition)","authors":"Radiation Oncology Physician Branch, Chinese Medical Doctor Association ,&nbsp;Radiation Oncology Branch, Chinese Medical Association,&nbsp;Professional Commitee of Radiation Oncology, China Anti-Cancer Association,&nbsp;Expert Committee of Esophageal Cancer, Chinese Cancer Radiotherapy Alliance,&nbsp;Radiotherapy Sub-Committee, Professional Commitee of Elderly Oncology, Gerontological Society of China","doi":"10.1016/j.radmp.2024.07.001","DOIUrl":"10.1016/j.radmp.2024.07.001","url":null,"abstract":"<div><div>China exhibits a high incidence of esophageal cancer. In the context of rapid population aging, esophageal cancer has become a significant threat to the health of Chinese elderly population. Currently, there is a lack of a clear definition or assessment method for esophageal cancer in elderly patients, and this population is frequently excluded in clinical trials. Consequently, high-level evidence and global consensus guidelines for the treatment of this population are unavailable. Since elderly patients with esophageal cancer cannot tolerate surgery and intensive chemotherapy, radiotherapy plays a vital role in their treatment. Based on recent research data on esophageal cancer in elderly patients, the expert consensus on radiotherapy for esophageal cancer in elderly patients in China was jointly developed by experts from the following organizations: Radiation Oncology Physician Branch, Chinese Medical Doctor Association; Radiation Oncology Branch, Chinese Medical Association; Professional Committee of Radiation Oncology, China Anti-Cancer Association; Expert Committee of Esophageal Cancer, Chinese Cancer Radiotherapy Alliance; Radiotherapy Sub-Committee, Professional Committee of Elderly Oncology, Gerontological Society of China. This consensus defines esophageal cancer in elderly patients, emphasizes the importance of nutritional assessment and intervention, and elaborates on the mode of radiotherapy alone and radiotherapy-based combined modality therapy mode. Moreover, this consensus organizes radiotherapy technology, radiation dose, and safety management, aiming to provide a foundational guide for clinical practice targeting esophageal cancer in elderly patients.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 268-275"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research needs, measurements and behaviours of environmental radon","authors":"Weihai Zhuo,&nbsp;Qiuju Guo,&nbsp;Quanfu Sun","doi":"10.1016/j.radmp.2024.10.005","DOIUrl":"10.1016/j.radmp.2024.10.005","url":null,"abstract":"","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 213-214"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the residential radon concentrations in the Bakony Region, Hungary","authors":"Zsolt Homoki,&nbsp;Gergely Tóth,&nbsp;Anita Csordás,&nbsp;Edit Tóth-Bodrogi,&nbsp;Miklós Hegedűs,&nbsp;Tibor Kovács","doi":"10.1016/j.radmp.2024.08.003","DOIUrl":"10.1016/j.radmp.2024.08.003","url":null,"abstract":"<div><h3>Objective</h3><div>To investigate the current levels of indoor radon activity in the geologically complex Bakony Region of Hungary, which has been historically affected by industrial activities, and to identify areas that may require further monitoring and intervention.</div></div><div><h3>Methods</h3><div>Experiments were carried out to measure quarterly indoor radon activity concentrations in ground-floor dwellings for a year using CR-39-type nuclear track detectors at 30 locations in 9 settlements to provide current information on the Bakony Region and identify areas requiring further attention.</div></div><div><h3>Results</h3><div>Since the annual average indoor radon activity concentration in the Bakony Region was 86 Bq/m³ and the maximum 274 Bq/m³, that is, less than the 300 Bq/m³ national and EU reference levels, it is considered safe. Two locations were equal to or exceeded the reference level during part of the year. While most of the Region exhibited high radon concentrations in the autumn and winter, two settlements presented inverse seasonal variations.</div></div><div><h3>Conclusion</h3><div>Although the autumn and winter values yielded a strong correlation with the annual mean and each other, this was not the case regarding the summer and spring values. The annual mean effective dose for the Region from the inhalation of radon and its progenies was estimated to be 2.2 ​mSv/year.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 243-247"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of radon detectors calibration system in Cameroon","authors":"Oumar Bobbo Modibo ,&nbsp;Gondji Dieu Souffit ,&nbsp;Koyang François ,&nbsp;Ndjana Nkoulou II Joseph Emmanuel ,&nbsp;Eka Djatnika Nugraha ,&nbsp;Chutima Kranrod ,&nbsp;Saïdou ,&nbsp;Shinji Tokonami","doi":"10.1016/j.radmp.2024.10.001","DOIUrl":"10.1016/j.radmp.2024.10.001","url":null,"abstract":"<div><h3>Objective</h3><div>To develop a radon detectors calibration system at the Research Centre for Nuclear Science and Technology (CRSTN) of the Institute of Geological and Mining Research (IRGM) in Cameroon.</div></div><div><h3>Methods</h3><div>A transparent box named radon chamber, a certified radon source, and a reference device have been provided to Cameroon by the International Atomic Energy Agency (IAEA) within the framework of a technical cooperation project. Depending on what radon levels are expected, two different configurations (Hookup I and Hookup II) of the system are adopted. Hookup I is a closed loop, and Hookup II is an open loop that samples fresh air.</div></div><div><h3>Results</h3><div>The operation of the system generates a radon concentration of up to ∼30,000 Bq/m³ when applied the Hookup I and of up to 1,000 Bq/m³ using the Hookup II configuration. For the calibration of the detectors for environmental radon monitoring, a stabilized concentration of 1,000 Bq/m³ is enough. Furthermore, temperature, relative humidity, and pressure, in the reference instrument ranged from 23 to 40°C, 32%–72%, and 929 to 936 mBar, respectively. Inside the radon chamber, temperature, relative humidity, and pressure are similar to the laboratory's condition.</div></div><div><h3>Conclusion</h3><div>The present calibration system will be useful for the calibration of radon detectors. The system can also be used for various purposes such as research activities on radon, education on radon detection, radon measurement, radon mitigation, radon mapping, protection against radon, and research in the African region.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 223-228"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An update on soil gas harvesting technique as a non-depleting source of 222Rn for a large volume calibration chamber for long-term exposure experiments","authors":"Vijith A.P.,&nbsp;Karunakara N.","doi":"10.1016/j.radmp.2024.10.002","DOIUrl":"10.1016/j.radmp.2024.10.002","url":null,"abstract":"<div><h3>Objective</h3><div>To demonstrate the versatility of the natural soil gas harvesting technique, coupled with a semi-dynamic injection algorithm, as an efficient and reliable source for continuous ²²²Rn delivery to a large-volume calibration chamber across different soil conditions and climatic conditions.</div></div><div><h3>Methods</h3><div>Long-term experiments were performed during three seasons of a year in a tropical monsoonal climatic region with high rainfall on the Southwest Coast of India. Soil gas extraction was performed using soil-gas probes, inserted to 1 ​m deep into the ground. Soil gas was harvested at a flow rate of 60 L/min, passed through a moisture trap, a ²²²Rn progeny filter, and a delay volume and pumped into a ²²²Rn calibration chamber of volume 22.7 ​m³. Continuous monitoring of ²²²Rn concentration in the chamber was performed using ionization chamber-based reference monitors. To achieve and maintain the desired ²²²Rn concentration values in the calibration chamber, the semi-dynamic injection method was adopted, in which the ²²²Rn concentration in the soil gas was monitored periodically, and injection into the chamber was controlled using a well-defined pumping algorithm. Three ranges of ²²²Rn concentration values were chosen as the target values to be maintained in the calibration chamber for long-term experiments (15 ​d): low concentration (500–1,000 Bq/m³), medium concentration (1,000–10,000 Bq/m³), and high concentration (10,000–25,000 Bq/m³).</div></div><div><h3>Results</h3><div>The achieved ²²²Rn concentration values were in good agreement with the target values, with deviations of 12%, 8% and 5% for the low, medium and high concentration exposures, respectively, during the summer season. During the monsoon season, the deviations between the target and the achieved concentration values were 12%, 10% and 5% for low, medium and high concentration exposures, respectively, and the corresponding deviations were 12%, 4%, and 5% for the winter season. These deviations are well within the cumulative uncertainty associated with the measurements.</div></div><div><h3>Conclusions</h3><div>The results of this study conclusively demonstrate that the soil gas harvesting method, when coupled with the semi-dynamic injection approach, is a reliable method for generating and maintaining the desired ²²²Rn concentration in the large volume calibration chamber during different seasons and environmental conditions.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 219-222"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radon exhalation rate from the latex pillows and its potential exposure to users","authors":"Phachirarat Sola ,&nbsp;Kanokporn Boonsirichai ,&nbsp;Santi Raksawong ,&nbsp;Ritiron Samran ,&nbsp;Pimprapa Chaijak ,&nbsp;Hirofumi Tazoe ,&nbsp;Chutima Kranrod ,&nbsp;Rawiwan Kritsananuwat ,&nbsp;Sattawat Jongjitklang ,&nbsp;Vichai Puripunyavanich ,&nbsp;Masahiro Hosoda ,&nbsp;Waleeporn Pongkua ,&nbsp;Shinji Tokonami","doi":"10.1016/j.radmp.2024.09.003","DOIUrl":"10.1016/j.radmp.2024.09.003","url":null,"abstract":"<div><h3>Objective</h3><div>To develop a new system to accurately measure the radon exhalation from the latex pillows, and to estimate its potential exposure to users.</div></div><div><h3>Methods</h3><div>The new system is composed of two loops, the first loop is designed to trap background radon and thoron until their levels are nearly zero, and the second loop is the measurement loop to detect radon and thoron exhalation rates from the pillows.</div></div><div><h3>Results</h3><div>The results showed that mass radon exhalation rated ranged from 0.18 Bq·kg⁻¹⋅h⁻¹ to 0.78 Bq·kg⁻¹⋅h⁻¹, with an average of (0.36 ​± ​0.17) Bq·kg⁻¹⋅h⁻¹ in the 9 samples. The average annual effective dose to users in a model room was estimated to be (15.51 ​± ​12.69) μSv by assuming two pillows was used.</div></div><div><h3>Conclusion</h3><div>These results demonstrate that the new system can effectively measure radon exhalation rates in latex pillows, and the potential exposure to radon exhalating from the pillows is very low.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 238-242"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radon exhalation and emanation assessments in the Transdanubian Central Mountain in Hungary","authors":"Maté Novák,&nbsp;Zsolt Homoki,&nbsp;Gergely Tóth,&nbsp;Anita Csordás,&nbsp;Edit Tóth-Bodrogi,&nbsp;Miklós Hegedűs,&nbsp;Tibor Kovács","doi":"10.1016/j.radmp.2024.08.004","DOIUrl":"10.1016/j.radmp.2024.08.004","url":null,"abstract":"<div><h3>Objective</h3><div>To determine the radium-226 activity concentration, the massic radon exhalation rate and emanation factor of 55 soil samples from the Central Transdanubian Mountains in Hungary as well as possible radon exhalation hotspots in the sampling area were determined. Further indoor measurements are planned to investigate the possible exposure to radon of the inhabitants.</div></div><div><h3>Methods</h3><div>The radium-226 activity concentration measurements were carried out with a semiconductor HPGe gamma-ray spectrometer. The massic radon exhalation rate and emanation factor were determined by measuring the radon activity concentrations using the accumulation method with a system developed by our department based on an AlphaGUARD DF2000 portable radon monitor.</div></div><div><h3>Results</h3><div>The activity concentrations of radium-226 were between (11.4 ​± ​2.5) and (118.2 ​± ​3.0) Bq/kg, while their average was 39.51 Bq/kg. The massic radon exhalation rates were between (1.02 ​± ​3.64) mBq⋅kg^−1⋅h⁻¹ and (275.63 ​± ​4.05) mBq⋅kg⁻¹⋅h⁻¹, while their average was 39.51 mBq⋅kg⁻¹⋅h⁻¹. Finally, the emanation factors were between (0.01 ​± ​0.04) and (0.80 ​± ​0.03) with an average of 0.30.</div></div><div><h3>Conclusions</h3><div>In our study, the results recorded from the bedrock at the sampling sites were analyzed. 9 samples were taken from sites comprised of limestone bedrock, moreover, the average radium-226 activity concentrations and massic radon exhalation rates at these sampling sites were higher than average. It was also concluded that although no regional correlation can be seen from the results, a possible smaller radon hotspot was identified from our measurements where further sampling will be carried out.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 254-259"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A humidity resistant radon source developed by ion exchange of radium in a membrane","authors":"Yanliang Chen,&nbsp;Linfeng He,&nbsp;Gang Han","doi":"10.1016/j.radmp.2024.09.004","DOIUrl":"10.1016/j.radmp.2024.09.004","url":null,"abstract":"<div><h3>Objective</h3><div>To develop a humidity resistant radon source on a membrane based on the ion exchange technique.</div></div><div><h3>Methods</h3><div>²²⁶Ra in its standard solution was adsorbed in the HP membrane through cation exchange. The radioactivity of ²²⁶Ra in the membrane was determined through the measurements of ²²⁶Ra activities in the solution before and after the adsorption using a HPGe γ spectrometer. The emanation coefficients of radon from the membrane in different humidity conditions were quantified through the measurements of radon concentrations in a close loop mode using the AlphaGUARD DF2000 radon monitor. Long-term measurements of radon concentrations in the close loop and a standard chamber using the membrane as radon source were performed to verify the stability of radon emanation from the source.</div></div><div><h3>Results</h3><div>A piece (70 ​mm ​× ​20 ​mm) of the HP membrane could adsorb 51.2 kBq of ²²⁶Ra in about 30 ​min. The emanation coefficient of radon from the membrane could reach as high as 0.997, and it was hardly changed in a humidity range from 7.5% RH to 94.5 ​% RH. The variation of the radon production rate from the source was only ±1.2 ​% in two weeks at a general laboratory condition, and its emanation stability was also confirmed in a standard radon chamber by using the membrane source for one month.</div></div><div><h3>Conclusion</h3><div>The radon membrane source developed in this study has a stable emanation coefficient regardless the environmental humidity. It can be used as a flow-through radon source in a standard radon chamber.</div></div>","PeriodicalId":34051,"journal":{"name":"Radiation Medicine and Protection","volume":"5 4","pages":"Pages 229-232"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}