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  1. Article ; Online: Characterization of SARS-CoV-2 Glycoprotein Using a Quantitative Cell-Cell Fusion System.

    Ou, Xiuyuan / Qian, Zhaohui

    Methods in molecular biology (Clifton, N.J.)

    2022  Volume 2610, Page(s) 179–186

    Abstract: Coronaviruses (CoVs) infect host cells through the fusion of viral and cellular membrane and may also spread to the neighboring uninfected cells from infected cells through cell-cell fusion. The viral spike (S) glycoproteins play an essential role in ... ...

    Abstract Coronaviruses (CoVs) infect host cells through the fusion of viral and cellular membrane and may also spread to the neighboring uninfected cells from infected cells through cell-cell fusion. The viral spike (S) glycoproteins play an essential role in mediating membrane fusion. Here, we present a luciferase-based quantitative assay to measure the efficiency of cell-cell fusion mediated by the S protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This method applies to S proteins of the other coronaviruses and can be adapted to fusion proteins of other enveloped viruses.
    MeSH term(s) Humans ; SARS-CoV-2/metabolism ; COVID-19 ; Cell Fusion ; Glycoproteins ; Spike Glycoprotein, Coronavirus/metabolism ; Virus Internalization
    Chemical Substances Glycoproteins ; Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2
    Language English
    Publishing date 2022-12-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-0716-2895-9_15
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Stabilization of the Metastable Pre-Fusion Conformation of the SARS-CoV-2 Spike Glycoprotein through N-Linked Glycosylation of the S2 Subunit.

    Zan, Fuwen / Zhou, Yao / Chen, Ting / Chen, Yahan / Mu, Zhixia / Qian, Zhaohui / Ou, Xiuyuan

    Viruses

    2024  Volume 16, Issue 2

    Abstract: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the novel coronavirus responsible for the coronavirus disease 2019 (COVID-19) pandemic, represents a serious threat to public health. The spike (S) glycoprotein of SARS-CoV-2 mediates viral ... ...

    Abstract Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the novel coronavirus responsible for the coronavirus disease 2019 (COVID-19) pandemic, represents a serious threat to public health. The spike (S) glycoprotein of SARS-CoV-2 mediates viral entry into host cells and is heavily glycosylated. In this study, we systemically analyzed the roles of 22 putative N-linked glycans in SARS-CoV-2 S protein expression, membrane fusion, viral entry, and stability. Using the α-glycosidase inhibitors castanospermine and NB-DNJ, we confirmed that disruption of N-linked glycosylation blocked the maturation of the S protein, leading to the impairment of S protein-mediated membrane fusion. Single-amino-acid substitution of each of the 22 N-linked glycosylation sites with glutamine revealed that 9 out of the 22 N-linked glycosylation sites were critical for S protein folding and maturation. Thus, substitution at these sites resulted in reduced S protein-mediated cell-cell fusion and viral entry. Notably, the N1074Q mutation markedly affected S protein stability and induced significant receptor-independent syncytium (RIS) formation in HEK293T/hACE2-KO cells. Additionally, the removal of the furin cleavage site partially compensated for the instability induced by the N1074Q mutation. Although the corresponding mutation in the SARS-CoV S protein (N1056Q) did not induce RIS in HEK293T cells, the N669Q and N1080Q mutants exhibited increased fusogenic activity and did induce syncytium formation in HEK293T cells. Therefore, N-glycans on the SARS-CoV and SARS-CoV-2 S2 subunits are highly important for maintaining the pre-fusion state of the S protein. This study revealed the critical roles of N-glycans in S protein maturation and stability, information that has implications for the design of vaccines and antiviral strategies.
    MeSH term(s) Humans ; SARS-CoV-2/genetics ; SARS-CoV-2/metabolism ; COVID-19 ; Spike Glycoprotein, Coronavirus/metabolism ; Glycosylation ; HEK293 Cells ; Severe acute respiratory syndrome-related coronavirus ; Polysaccharides/metabolism ; Virus Internalization
    Chemical Substances spike protein, SARS-CoV-2 ; Spike Glycoprotein, Coronavirus ; Polysaccharides
    Language English
    Publishing date 2024-01-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v16020223
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Essential tremor-Parkinson's disease syndrome

    Yanbing Hou / Qin Han / Ruwei Ou / Kuncheng Liu / Junyu Lin / Tianmi Yang / Huifang Shang / Yanjie Yin / Xiuyuan Hao

    Chinese Medical Journal, Vol 136, Iss 4, Pp 446-

    clinical characteristics and subtypes using cluster analysis

    2023  Volume 450

    Abstract: Abstract. Background:. Essential tremor (ET) and Parkinson's disease (PD) are common movement disorders. ET-PD syndrome is characterized by the occurrence of PD in patients with a previous history of ET, which may be an independent phenotype distinct ... ...

    Abstract Abstract. Background:. Essential tremor (ET) and Parkinson's disease (PD) are common movement disorders. ET-PD syndrome is characterized by the occurrence of PD in patients with a previous history of ET, which may be an independent phenotype distinct from PD. This study aims to identify clinical characteristics and subtypes in ET-PD. Methods:. A total of 93 newly diagnosed ET-PD patients and 93 newly diagnosed PD patients matched for age, sex, education, and disease duration of PD were selected using propensity score matching analysis. The K-means cluster analysis was performed for 11 variables derived from the ET-PD group, and cluster profiles were established through statistical analysis of demographic and clinical variables. Results:. The ET-PD group consisted of a high number of patients with a family history of ET exhibiting evident tremor with milder hypokinesia and postural instability symptoms, as compared to the PD group. Through the cluster analysis, two clusters of ET-PD patients were identified. The ET-PD cluster 1 (n = 34) had a shorter ET duration before PD onset, lower number of patients with a family history of ET, higher unified PD rating scale instability scores, higher non-motor symptoms scores (non-motor symptoms scale D1 scores, Hamilton depression scale scores, Hamilton anxiety scale scores, and PD sleep scale-2 scores), and higher Chinese version of the PD questionnaire-39 scores relative to the ET-PD cluster 2 (n = 59). Conclusion:. ET-PD patients had significantly different characteristics for motor symptoms as compared to PD patients, and may be distinctly divided into two clinical subtypes, namely, the ET-PD complex type and the ET-PD simple type.
    Keywords Medicine ; R
    Subject code 310
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher Wolters Kluwer
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Author Correction: Host susceptibility and structural and immunological insight of S proteins of two SARS-CoV-2 closely related bat coronaviruses.

    Ou, Xiuyuan / Xu, Ge / Li, Pei / Liu, Yan / Zan, Fuwen / Liu, Pan / Hu, Jiaxin / Lu, Xing / Dong, Siwen / Zhou, Yao / Mu, Zhixia / Wu, Zhiqiang / Wang, Jianwei / Jin, Qi / Liu, Pinghuang / Lu, Jian / Wang, Xiangxi / Qian, Zhaohui

    Cell discovery

    2023  Volume 9, Issue 1, Page(s) 102

    Language English
    Publishing date 2023-10-09
    Publishing country England
    Document type Published Erratum
    ISSN 2056-5968
    ISSN 2056-5968
    DOI 10.1038/s41421-023-00597-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Induction of apoptosis by Xiakemycin A in human hepatoma HepG2 cells.

    Chen, Chuan / Han, Zhu / Yang, Minjie / Jiang, Zhongke / Ou, Xiuyuan

    Medicine

    2020  Volume 99, Issue 17, Page(s) e19848

    Abstract: Xiakemycin A (XKA), a new antibiotic in the pyranonaphthoquinone family, shows antitumor activity. However, the type of cell death induced by XKA remains elusive. In this study, we aim to investigate the type of death induced by XKA in hepatic cancer.The ...

    Abstract Xiakemycin A (XKA), a new antibiotic in the pyranonaphthoquinone family, shows antitumor activity. However, the type of cell death induced by XKA remains elusive. In this study, we aim to investigate the type of death induced by XKA in hepatic cancer.The apoptotic features, such as chromatic agglutination, reactive oxygen species generation and membrane potential of mitochondria, in HepG2 cells treated by XKA were measured by Hoechst 33342 staining and flow cytometry. Apoptosis of HepG2 cells treated with XKA was determined by Annexin V-FITC/propidium iodide double staining and Western blot analysis, respectively.XKA had a significant dose-dependent elevation of chromatic agglutination, reactive oxygen species generation, Annexin V and propidium iodide staining, decrease of membrane potential. Meanwhile, in apoptotic HepG2 cells induced by XKA, robust increment was noticed in p53 expression, cleavage of PARP, caspase-3, and caspase-9.XKA showed potent inhibitory effects on the proliferation of HepG2 cells. Such phenomenon may be related to activation of the apoptotic pathway.
    MeSH term(s) Annexin A5/metabolism ; Antineoplastic Agents/pharmacology ; Apoptosis/drug effects ; Carcinoma, Hepatocellular/drug therapy ; Carcinoma, Hepatocellular/pathology ; Caspase 3/metabolism ; Caspase 9/metabolism ; DNA Damage/drug effects ; Dose-Response Relationship, Drug ; Hep G2 Cells ; Humans ; Membrane Potentials/drug effects ; Mitochondria, Liver/physiology ; Naphthoquinones/pharmacology ; Poly (ADP-Ribose) Polymerase-1/metabolism ; Propidium/metabolism ; Reactive Oxygen Species/metabolism
    Chemical Substances Annexin A5 ; Antineoplastic Agents ; Naphthoquinones ; Reactive Oxygen Species ; xiakemycin A ; Propidium (36015-30-2) ; PARP1 protein, human (EC 2.4.2.30) ; Poly (ADP-Ribose) Polymerase-1 (EC 2.4.2.30) ; CASP3 protein, human (EC 3.4.22.-) ; CASP9 protein, human (EC 3.4.22.-) ; Caspase 3 (EC 3.4.22.-) ; Caspase 9 (EC 3.4.22.-)
    Language English
    Publishing date 2020-05-26
    Publishing country United States
    Document type Journal Article ; Observational Study
    ZDB-ID 80184-7
    ISSN 1536-5964 ; 0025-7974
    ISSN (online) 1536-5964
    ISSN 0025-7974
    DOI 10.1097/MD.0000000000019848
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Effect of polymorphism in Rhinolophus affinis ACE2 on entry of SARS-CoV-2 related bat coronaviruses.

    Pei Li / Jiaxin Hu / Yan Liu / Xiuyuan Ou / Zhixia Mu / Xing Lu / Fuwen Zan / Mengmeng Cao / Lin Tan / Siwen Dong / Yao Zhou / Jian Lu / Qi Jin / Jianwei Wang / Zhiqiang Wu / Yingtao Zhang / Zhaohui Qian

    PLoS Pathogens, Vol 19, Iss 1, p e

    2023  Volume 1011116

    Abstract: Bat coronavirus RaTG13 shares about 96.2% nucleotide sequence identity with that of SARS-CoV-2 and uses human and Rhinolophus affinis (Ra) angiotensin-converting enzyme 2 (ACE2) as entry receptors. Whether there are bat species other than R. affinis ... ...

    Abstract Bat coronavirus RaTG13 shares about 96.2% nucleotide sequence identity with that of SARS-CoV-2 and uses human and Rhinolophus affinis (Ra) angiotensin-converting enzyme 2 (ACE2) as entry receptors. Whether there are bat species other than R. affinis susceptible to RaTG13 infection remains elusive. Here, we show that, among 18 different bat ACE2s tested, only RaACE2 is highly susceptible to transduction by RaTG13 S pseudovirions, indicating that the bat species harboring RaTG13 might be very limited. RaACE2 has seven polymorphic variants, RA-01 to RA-07, and they show different susceptibilities to RaTG13 S pseudovirions transduction. Sequence and mutagenesis analyses reveal that residues 34, 38, and 83 in RaACE2 might play critical roles in interaction with the RaTG13 S protein. Of note, RaACE2 polymorphisms have minimal effect on S proteins of SARS-CoV-2 and several SARS-CoV-2 related CoVs (SC2r-CoVs) including BANAL-20-52 and BANAL-20-236 in terms of binding, membrane fusion, and pseudovirus entry. Further mutagenesis analyses identify residues 501 and 505 in S proteins critical for the recognition of different RaACE2 variants and pangolin ACE2 (pACE2), indicating that RaTG13 might have not been well adapted to R. affinis bats. While single D501N and H505Y changes in RaTG13 S protein significantly enhance the infectivity and minimize the difference in susceptibility among different RaACE2 variants, an N501D substitution in SARS-CoV-2 S protein displays marked disparity in transduction efficiencies among RaACE2 variants with a significant reduction in infectivity on several RaACE2 variants. Finally, a T372A substitution in RaTG13 S protein not only significantly increases infectivity on all RaACE2 variants, but also markedly enhances entry on several bat ACE2s including R. sinicus YN, R. pearsonii, and R. ferrumeiqunum. However, the T372A mutant is about 4-fold more sensitive to neutralizing sera from mice immunized with BANAL-20-52 S, suggesting that the better immune evasion ability of T372 over A372 might ...
    Keywords Immunologic diseases. Allergy ; RC581-607 ; Biology (General) ; QH301-705.5
    Subject code 572
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Host susceptibility and structural and immunological insight of S proteins of two SARS-CoV-2 closely related bat coronaviruses.

    Ou, Xiuyuan / Xu, Ge / Li, Pei / Liu, Yan / Zan, Fuwen / Liu, Pan / Hu, Jiaxin / Lu, Xing / Dong, Siwen / Zhou, Yao / Mu, Zhixia / Wu, Zhiqiang / Wang, Jianwei / Jin, Qi / Liu, Pinghuang / Lu, Jian / Wang, Xiangxi / Qian, Zhaohui

    Cell discovery

    2023  Volume 9, Issue 1, Page(s) 78

    Abstract: The bat coronaviruses (CoV) BANAL-20-52 and BANAL-20-236 are two newly identified severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) closely related coronaviruses (SC2r-CoV) and the genome of BANAL-20-52 shares the highest homology with SARS- ... ...

    Abstract The bat coronaviruses (CoV) BANAL-20-52 and BANAL-20-236 are two newly identified severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) closely related coronaviruses (SC2r-CoV) and the genome of BANAL-20-52 shares the highest homology with SARS-CoV-2. However, the risk of their potential zoonotic transmission has not been fully evaluated. Here, we determined their potential host susceptibility among 13 different bat species and 26 different animal species, and found that both might have extensive host ranges, indicating high zoonotic transmission potential. We also determined the cryo-EM structures of BANAL-20-52 and BANAL-20-236 S proteins at pH 5.5 and the complex of BANAL-20-236 S1 and Rhinolophus affinis ACE2, and found that both trimeric S proteins adopt all three receptor binding domains (RBDs) in "closed" conformation and are more compact than SARS-CoV-2. Strikingly, the unique sugar moiety at N370 of bat SC2r-CoVs acts like a "bolt" and crosses over two neighboring subunits, facilitating the S proteins in the locked conformation and underpinning the architecture stability. Removal of the glycosylation at N370 by a T372A substitution substantially enhances virus infectivity but becomes highly sensitive to trypsin digestion at pH 5.5, a condition roughly mimicking the insectivorous bat's stomach digestion. In contrast, WT S proteins of SC2r-CoVs showed considerable resistance to trypsin digestion at pH 5.5, indicating that the highly conserved T372 in bat CoVs might result from the selective advantages in stability during the fecal-oral transmission over A372. Moreover, the results of cross-immunogenicity among S proteins of SARS-CoV-2, BANAL-20-52, and BANAL-20-236 showed that A372 pseudoviruses are more sensitive to anti-S sera than T372, indicating that immune evasion might also play a role in the natural selection of T372 over A372 during evolution. Finally, residues 493 and 498 of the S protein affect host susceptibility, and residue 498 also influences the immunogenicity of the S protein. Together, our findings aid a better understanding of the molecular basis of CoV entry, selective evolution, and immunogenicity and highlight the importance of surveillance of susceptible hosts of these viruses to prevent potential outbreaks.
    Language English
    Publishing date 2023-07-28
    Publishing country England
    Document type Journal Article
    ISSN 2056-5968
    ISSN 2056-5968
    DOI 10.1038/s41421-023-00581-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Effect of polymorphism in Rhinolophus affinis ACE2 on entry of SARS-CoV-2 related bat coronaviruses.

    Li, Pei / Hu, Jiaxin / Liu, Yan / Ou, Xiuyuan / Mu, Zhixia / Lu, Xing / Zan, Fuwen / Cao, Mengmeng / Tan, Lin / Dong, Siwen / Zhou, Yao / Lu, Jian / Jin, Qi / Wang, Jianwei / Wu, Zhiqiang / Zhang, Yingtao / Qian, Zhaohui

    PLoS pathogens

    2023  Volume 19, Issue 1, Page(s) e1011116

    Abstract: Bat coronavirus RaTG13 shares about 96.2% nucleotide sequence identity with that of SARS-CoV-2 and uses human and Rhinolophus affinis (Ra) angiotensin-converting enzyme 2 (ACE2) as entry receptors. Whether there are bat species other than R. affinis ... ...

    Abstract Bat coronavirus RaTG13 shares about 96.2% nucleotide sequence identity with that of SARS-CoV-2 and uses human and Rhinolophus affinis (Ra) angiotensin-converting enzyme 2 (ACE2) as entry receptors. Whether there are bat species other than R. affinis susceptible to RaTG13 infection remains elusive. Here, we show that, among 18 different bat ACE2s tested, only RaACE2 is highly susceptible to transduction by RaTG13 S pseudovirions, indicating that the bat species harboring RaTG13 might be very limited. RaACE2 has seven polymorphic variants, RA-01 to RA-07, and they show different susceptibilities to RaTG13 S pseudovirions transduction. Sequence and mutagenesis analyses reveal that residues 34, 38, and 83 in RaACE2 might play critical roles in interaction with the RaTG13 S protein. Of note, RaACE2 polymorphisms have minimal effect on S proteins of SARS-CoV-2 and several SARS-CoV-2 related CoVs (SC2r-CoVs) including BANAL-20-52 and BANAL-20-236 in terms of binding, membrane fusion, and pseudovirus entry. Further mutagenesis analyses identify residues 501 and 505 in S proteins critical for the recognition of different RaACE2 variants and pangolin ACE2 (pACE2), indicating that RaTG13 might have not been well adapted to R. affinis bats. While single D501N and H505Y changes in RaTG13 S protein significantly enhance the infectivity and minimize the difference in susceptibility among different RaACE2 variants, an N501D substitution in SARS-CoV-2 S protein displays marked disparity in transduction efficiencies among RaACE2 variants with a significant reduction in infectivity on several RaACE2 variants. Finally, a T372A substitution in RaTG13 S protein not only significantly increases infectivity on all RaACE2 variants, but also markedly enhances entry on several bat ACE2s including R. sinicus YN, R. pearsonii, and R. ferrumeiqunum. However, the T372A mutant is about 4-fold more sensitive to neutralizing sera from mice immunized with BANAL-20-52 S, suggesting that the better immune evasion ability of T372 over A372 might contribute to the natural selective advantage of T372 over A372 among bat CoVs. Together, our study aids a better understanding of coronavirus entry, vaccine design, and evolution.
    MeSH term(s) Animals ; Mice ; Humans ; SARS-CoV-2/metabolism ; Chiroptera ; Angiotensin-Converting Enzyme 2 ; COVID-19 ; Spike Glycoprotein, Coronavirus/metabolism
    Chemical Substances spike protein, SARS-CoV-2 ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23) ; Spike Glycoprotein, Coronavirus
    Language English
    Publishing date 2023-01-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2205412-1
    ISSN 1553-7374 ; 1553-7374
    ISSN (online) 1553-7374
    ISSN 1553-7374
    DOI 10.1371/journal.ppat.1011116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Author Correction: Characterization of spike glycoprotein of SARS-CoV-2 on virus entry and its immune cross-reactivity with SARS-CoV.

    Ou, Xiuyuan / Liu, Yan / Lei, Xiaobo / Li, Pei / Mi, Dan / Ren, Lili / Guo, Li / Guo, Ruixuan / Chen, Ting / Hu, Jiaxin / Xiang, Zichun / Mu, Zhixia / Chen, Xing / Chen, Jieyong / Hu, Keping / Jin, Qi / Wang, Jianwei / Qian, Zhaohui

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 2144

    Language English
    Publishing date 2021-04-01
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-22614-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: The

    Li, Pei / Guo, Ruixuan / Liu, Yan / Zhang, Yingtao / Hu, Jiaxin / Ou, Xiuyuan / Mi, Dan / Chen, Ting / Mu, Zhixia / Han, Yelin / Chen, Zihan / Cui, Zhewei / Zhang, Leiliang / Wang, Xinquan / Wu, Zhiqiang / Wang, Jianwei / Jin, Qi / Qian, Zhaohui

    Science bulletin

    2021  Volume 66, Issue 12, Page(s) 1215–1227

    Abstract: Bat coronavirus (CoV) RaTG13 shares the highest genome sequence identity with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among all known coronaviruses, and also uses human angiotensin converting enzyme 2 (hACE2) for virus entry. Thus, ... ...

    Abstract Bat coronavirus (CoV) RaTG13 shares the highest genome sequence identity with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among all known coronaviruses, and also uses human angiotensin converting enzyme 2 (hACE2) for virus entry. Thus, SARS-CoV-2 is thought to have originated from bat. However, whether SARS-CoV-2 emerged from bats directly or through an intermediate host remains elusive. Here, we found that
    Language English
    Publishing date 2021-01-19
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2816140-3
    ISSN 2095-9281 ; 2095-9273
    ISSN (online) 2095-9281
    ISSN 2095-9273
    DOI 10.1016/j.scib.2021.01.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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