Acta Psychologica Sinica ›› 2021, Vol. 53 ›› Issue (2): 170-181.doi: 10.3724/SP.J.1041.2021.00170
• Reports of Empirical Studies • Previous Articles Next Articles
LIU Xiaowei, PAN Bin, CHEN Liang, LI Tengfei, JI Linqin, ZHANG Wenxin()
Received:
2020-05-12
Published:
2021-02-25
Online:
2020-12-29
Contact:
ZHANG Wenxin
E-mail:zhangwenxin@sdnu.edu.cn
Supported by:
LIU Xiaowei, PAN Bin, CHEN Liang, LI Tengfei, JI Linqin, ZHANG Wenxin. (2021). Healthy Context Paradox in the Association Between Bullying Victimization and Externalizing Problems: The Mediating Role of Hostile Attribution Bias. Acta Psychologica Sinica, 53(2), 170-181.
Add to citation manager EndNote|Ris|BibTeX
URL: https://journal.psych.ac.cn/acps/EN/10.3724/SP.J.1041.2021.00170
Variable | M | SD | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|---|---|
Individual-level | |||||||
1. Gender | — | — | — | ||||
2. Mother’s education | 3.81 | 1.20 | 0.01 | — | |||
3. Father’s education | 3.99 | 1.22 | 0.02 | 0.73** | — | ||
4. Bullying victimization | 0.38 | 0.60 | -0.10** | -0.05* | -0.04 | — | |
5. Hostile attribution bias | 0.20 | 0.22 | 0.04 | -0.02 | -0.02 | 0.31** | — |
6. Externalizing problems | 0.18 | 0.20 | -0.07** | -0.02 | -0.05 | 0.28** | 0.26** |
Classroom-Level | |||||||
1. Grade | — | — | — | ||||
2. Class size | 39.67 | 8.19 | 0.53*** | — | |||
3. Classroom-level bullying victimization | 0.38 | 0.13 | -0.31*** | -0.03 | — |
Table 1 Mean, standard deviation and correlation coefficient of individual-level and classroom-level variables
Variable | M | SD | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|---|---|
Individual-level | |||||||
1. Gender | — | — | — | ||||
2. Mother’s education | 3.81 | 1.20 | 0.01 | — | |||
3. Father’s education | 3.99 | 1.22 | 0.02 | 0.73** | — | ||
4. Bullying victimization | 0.38 | 0.60 | -0.10** | -0.05* | -0.04 | — | |
5. Hostile attribution bias | 0.20 | 0.22 | 0.04 | -0.02 | -0.02 | 0.31** | — |
6. Externalizing problems | 0.18 | 0.20 | -0.07** | -0.02 | -0.05 | 0.28** | 0.26** |
Classroom-Level | |||||||
1. Grade | — | — | — | ||||
2. Class size | 39.67 | 8.19 | 0.53*** | — | |||
3. Classroom-level bullying victimization | 0.38 | 0.13 | -0.31*** | -0.03 | — |
Dependent variable | M1: Individual-level model | M2: Classroom-level model | M3: Mediating moderation model | |
---|---|---|---|---|
Externalizing problem | Externalizing problem | Hostile attribution bias | Externalizing problem | |
Intercept | 0.191*** | 0.168*** | 0.198*** | 0.162*** |
Individual-level | ||||
Gender | -0.018* | -0.016 | 0.038*** | -0.022** |
Father’s education | 0.002 | 0.001 | -0.001 | 0.002* |
Mother’s education | 0.000 | 0.000 | 0.001 | 0.000 |
Individual-level victimization | 0.081*** | 0.068*** | 0.165*** | 0.041** |
Hostile attribution bias | 0.161*** | |||
Classroom-level | ||||
Grade | 0.048** | -0.049 | 0.049** | |
Classroom size | -0.002 | 0.000 | -0.002* | |
Classroom-level victimization | 0.094 | 0.135* | 0.096 | |
Cross-level interaction | ||||
Grade × bullying victimization | 0.073* | -0.049 | 0.081** | |
Classroom size × victimization | -0.001 | 0.002 | -0.001 | |
Classroom-level victimization × victimization | -0.263* | -0.470*** | -0.186 | |
Random effect | ||||
σ2 | 0.036*** | 0.033*** | 0.041*** | 0.032*** |
τ00 | 0.002* | 0.001* | 0.198*** | 0.001* |
τ11 | 0.004** | 0.165 | 0.004** |
Table 2 Multilevel model
Dependent variable | M1: Individual-level model | M2: Classroom-level model | M3: Mediating moderation model | |
---|---|---|---|---|
Externalizing problem | Externalizing problem | Hostile attribution bias | Externalizing problem | |
Intercept | 0.191*** | 0.168*** | 0.198*** | 0.162*** |
Individual-level | ||||
Gender | -0.018* | -0.016 | 0.038*** | -0.022** |
Father’s education | 0.002 | 0.001 | -0.001 | 0.002* |
Mother’s education | 0.000 | 0.000 | 0.001 | 0.000 |
Individual-level victimization | 0.081*** | 0.068*** | 0.165*** | 0.041** |
Hostile attribution bias | 0.161*** | |||
Classroom-level | ||||
Grade | 0.048** | -0.049 | 0.049** | |
Classroom size | -0.002 | 0.000 | -0.002* | |
Classroom-level victimization | 0.094 | 0.135* | 0.096 | |
Cross-level interaction | ||||
Grade × bullying victimization | 0.073* | -0.049 | 0.081** | |
Classroom size × victimization | -0.001 | 0.002 | -0.001 | |
Classroom-level victimization × victimization | -0.263* | -0.470*** | -0.186 | |
Random effect | ||||
σ2 | 0.036*** | 0.033*** | 0.041*** | 0.032*** |
τ00 | 0.002* | 0.001* | 0.198*** | 0.001* |
τ11 | 0.004** | 0.165 | 0.004** |
[1] | Achenbach, T. M. (1985). Assessment and taxonomy of child and adolescent psychopathology. Sage Publications, Inc. |
[2] | Achenbach, T. M., & Rescorla, L. (2001). Manual for the ASEBA school-age forms & profiles: An integrated system of multi-informant assessment. ASEBA. |
[3] | Aiken, L. S., & West, S. G. (1991). Multiple regression: Testing and interpreting interactions. Newbury Park, CA: Sage. |
[4] |
Bellmore, A. D., Witkow, M. R., Graham, S., & Juvonen, J. (2004). Beyond the individual: The impact of ethnic context and classroom behavioral norms on victims’ adjustment. Developmental Psychology, 40(6), 1159-1172. https://doi.org/10.1037/0012-1649.40.6.1159
doi: 10.1037/0012-1649.40.6.1159 URL pmid: 15535764 |
[5] |
Brendgen, M., Vitaro, F., Barker, E. D., Girard, A., Dionne, G., Tremblay, R. E., & Boivin, M. (2013). Do other people’s plights matter? A genetically informed twin study of the role of social context in the link between peer victimization and children’s aggression and depression symptoms. Developmental Psychology, 49(2), 327-340. https://doi.org/10.1037/a0025665
doi: 10.1037/a0025665 URL |
[6] |
Broidy, L. M., Nagin, D. S., Tremblay, R. E., Bates, J. E., Brame, B., Dodge, K. A., … Vitaro, F. (2003). Developmental trajectories of childhood disruptive behaviors and adolescent delinquency: A six-site, cross-national study. Developmental Psychology, 39(2), 222-245. https://doi.org/10.1037/0012-1649.39.2.222
doi: 10.1037//0012-1649.39.2.222 URL pmid: 12661883 |
[7] |
Cao, C., Wang, M. P., Zhang, W. X., Ji, L. Q., Chen, L., & Chen, X. Y. (2014). Interaction between COMT gene rs6267 polymorphism and maternal parenting behavior on adolescents’ physical and relational aggression. Acta Psychologica Sinica, 46(10), 1486-1497. https://doi.org/10.3724/SP.J.1041.2014.01486
doi: 10.3724/SP.J.1041.2014.01486 URL |
[8] |
Casper, D. M., & Card, N. A. (2017). Overt and relational victimization: A meta-analytic review of their overlap and associations with social-psychological adjustment. Child Development, 88(2), 466-483. https://doi.org/10.1111/cdev.12621
URL pmid: 27709610 |
[9] | Chen, G. H., Zhang, W. X., & Wang, S. Q. (2009). Agreement among different informants over ratings of adolescent externalizing behaviors. Acta Pcychologica Sinica, 41(2), 144-155. |
[10] |
Chen, J., Yu, J., Zhang, J., Li, X., & McGue, M. (2015). Investigating genetic and environmental contributions to adolescent externalizing behavior in a collectivistic culture: A multi-informant twin study. Psychological Medicine, 45(9), 1989-1997. https://doi.org/10.1017/S0033291714003109
doi: 10.1017/S0033291714003109 URL pmid: 25572795 |
[11] | Crick, N. R., & Dodge, K. A. (1994). A review and reformulation of social information-processing mechanisms in children’s social adjustment. Psychological Bulletin, 115(1), 74-101. |
[12] | Dodge, K. A., Coie, J. D., & Lynam, D. (2006). Aggression and antisocial behavior in youth. In W. Damon (Series Ed.) & N. Eisenberg (Vol. Ed.), Handbook of child psychology, Vol. 3: Social, emotional, personality development )6th ed., pp. 719-788). Hoboken, NJ: Wiley. |
[13] | Garandeau, C. F., Lee, I. A., & Salmivalli, C. (2018). Decreases in the proportion of bullying victims in the classroom: Effects on the adjustment of remaining victims. International Journal of Behavioral Development, 42(1), 64-72. https://doi.org/10.1177/0165025416667492 |
[14] | Garandeau, C. F., & Salmivalli, C. (2019). Can healthier contexts be harmful? A new perspective on the plight of victims of bullying. Child Development Perspectives, 13(3), 147-152. https://doi.org/10.1111/cdep.12331 |
[15] |
Gerber, J. P., Wheeler, L., & Suls, J. (2018). A social comparison theory meta-analysis 60+ years on. Psychological Bulletin, 144(2), 177-197. https://doi.org/10.1037/bul0000127
doi: 10.1037/bul0000127 URL pmid: 29144145 |
[16] | Gini, G., Holt, Pozzoli, T., & Marino. (2020). Peer victimization and somatic problems: The role of class victimization levels. Journal of School Health, 90(1), 39-46. https://doi.org/10.1111/josh.12844 |
[17] |
Gregson, K. D., Tu, K. M., & Erath, S. A. (2014). Sweating under pressure: Skin conductance level reactivity moderates the association between peer victimization and externalizing behavior. Journal of Child Psychology and Psychiatry, 55(1), 22-30. https://doi.org/10.1111/jcpp.12086
doi: 10.1111/jcpp.12086 URL pmid: 23734821 |
[18] |
Guy, A., Lee, K., & Wolke, D. (2017). Differences in the early stages of social information processing for adolescents involved in bullying. Aggressive Behavior, 43(6), 578-587. https://doi.org/10.1002/ab.21716
doi: 10.1002/ab.21716 URL pmid: 28589674 |
[19] | Hoglund, W. L., & Leadbeater, B. J. (2007). Managing threat: Do social-cognitive processes mediate the link between peer victimization and adjustment problems in early adolescence? Journal of Research on Adolescence, 17(3), 525-540. https://doi.org/10.1111/j.1532-7795.2007.00533.x |
[20] |
Huitsing, G., Lodder, G. M. A., Oldenburg, B., Schacter, H. L., Salmivalli, C., Juvonen, J., & Veenstra, R. (2019). The healthy context paradox: Victims’ adjustment during an anti-bullying intervention. Journal of Child and Family Studies, 28(9), 2499-2509. https://doi.org/10.1007/s10826-018-1194-1
doi: 10.1007/s10826-018-1194-1 URL |
[21] | Huitsing, G., Veenstra, R., Sainio, M., & Salmivalli, C. (2012). “It must be me” or “It could be them?”: The impact of the social network position of bullies and victims on victims’ adjustment. Social Networks, 34(4), 379-386. https://doi.org/10.1016/j.socnet.2010.07.002 |
[22] | Ji, L. Q., Wei, X., Chen, L., & Zhang, W. X. (2012). Peer relationship adversities and children’s aggression during late childhood: The mediating roles of self-conception and peer beliefs. Acta Psychologica Sinica, 44(11), 1479-1489. https://doi.org/10.3724/SP.J.1041.2012.01479 |
[23] | Julian, M. W. (2001). The consequences of ignoring multilevel data structures in nonhierarchical covariance modeling. Structural Equation Modeling, 8(3), 325-352. https://doi.org/10.1207/S15328007SEM0803_1 |
[24] |
Karriker-Jaffe, K. J., Lönn, S. L., Cook, W. K., Kendler, K. S., & Sundquist, K. (2020). Young men’s behavioral competencies and risk of alcohol use disorder in emerging adulthood: Early protective effects of parental education. Development and Psychopathology, 1-14. https://doi.org/10.1017/S0954579419001640
doi: 10.1017/S095457942000108X URL pmid: 33432895 |
[25] | Kochenderfer-Ladd, B. (2004). Peer victimization: The role of emotions in adaptive and maladaptive coping. Social Development, 13(3), 329-349. https://doi.org/10.1111/j.1467-9507.2004.00271.x |
[26] | Lansford, J. E., Malone, P. S., Dodge, K. A., Pettit, G. S., & Bates, J. E. (2010). Developmental cascades of peer rejection, social information processing biases, and aggression during middle childhood. Development and Psychopathology, 22(3), 593-602. https://doi.org/10.1017/S0954579410000301 |
[27] | Lei, L., Wang, Y., Guo, B. L., & Zhang, L. (2004). The influence of classroom norms on the relations between social behaviors and peer victimization. Acta Psychologica Sinica, 36(5), 563-567. |
[28] |
Moffitt, T. E. (1993). Life-course-persistent and adolescence- limited antisocial behavior: A developmental taxonomy. Psychological Review, 100(4), 674-701.
URL pmid: 8255953 |
[29] | Muthén, L. K., & Muthén, B. O. (2012). Mplus statistical modeling software. Los Angeles: Muthén & Muthén. |
[30] |
Nelson, D. A., Mitchell, C., & Yang, C. (2008). Intent attributions and aggression: A study of children and their parents. Journal of Abnormal Child Psychology, 36(6), 793-806. https://doi.org/10.1007/s10802-007-9211-7
doi: 10.1007/s10802-007-9211-7 URL pmid: 18256923 |
[31] |
Nishina, A., & Juvonen, J. (2005). Daily reports of witnessing and experiencing peer harassment in middle school. Child Development, 76(2), 435-450. https://doi.org/10.1111/j.1467-8624.2005.00855.x
doi: 10.1111/j.1467-8624.2005.00855.x URL pmid: 15784092 |
[32] |
Odgers, C. L., Moffitt, T. E., Broadbent, J. M., Dickson, N., Hancox, R. J., Harrington, H., … Caspi, A. (2008). Female and male antisocial trajectories: From childhood origins to adult outcomes. Development and Psychopathology, 20(2), 673-716. https://doi.org/10.1017/S0954579408000333
doi: 10.1017/S0954579408000333 URL pmid: 18423100 |
[33] | Olweus, D. (1993). Bullying at school: What we know and what we can do. Oxford: Blackwell. |
[34] |
Perren, S., Ettekal, I., & Ladd, G. (2013). The impact of peer victimization on later maladjustment: Mediating and moderating effects of hostile and self-blaming attributions. Journal of Child Psychology and Psychiatry, 54(1), 46-55. https://doi.org/10.1111/j.1469-7610.2012.02618.x
doi: 10.1111/j.1469-7610.2012.02618.x URL |
[35] |
Petersen, I. T., Bates, J. E., Dodge, K. A., Lansford, J. E., & Pettit, G. S. (2015). Describing and predicting developmental profiles of externalizing problems from childhood to adulthood. Development and Psychopathology, 27(3), 791-818. https://doi.org/10.1017/S0954579414000789
doi: 10.1017/S0954579414000789 URL pmid: 25166430 |
[36] |
Peugh, J. L. (2010). A practical guide to multilevel modeling. Journal of School Psychology, 48(1), 85-112. https://doi.org/10.1016/j.jsp.2009.09.002
doi: 10.1016/j.jsp.2009.09.002 URL |
[37] |
Podsakoff, P. M., MacKenzie, S. B., Lee, J. Y., & Podsakoff, N. P. (2003). Common method biases in behavioral research: A critical review of the literature and recommended remedies. Journal of Applied Psychology, 88(5), 879-903. https://doi.org/10.1037/0021-9010.88.5.879
doi: 10.1037/0021-9010.88.5.879 URL |
[38] |
Reijntjes, A., Kamphuis, J. H., Prinzie, P., Boelen, P. A., van der Schoot, M., & Telch, M. J. (2011). Prospective linkages between peer victimization and externalizing problems in children: A meta-analysis. Aggressive Behavior, 37(3), 215-222. https://doi.org/10.1002/ab.20374
doi: 10.1002/ab.20374 URL |
[39] |
Rudolph, K. D., Lansford, J. E., Agoston, A. M., Sugimura, N., Schwartz, D., Dodge, K. A., … Bates, J. E. (2014). Peer victimization and social alienation: Predicting deviant peer affiliation in middle school. Child Development, 85(1), 124-139. https://doi.org/10.1111/cdev.12112
doi: 10.1111/cdev.12112 URL |
[40] | Saarento, S., Garandeau, C. F., & Salmivalli, C. (2015). Classroom- and school-level contributions to bullying and victimization: A review. Journal of Community & Applied Social Psychology, 25(3), 204-218. https://doi.org/10.1002/casp.2207 |
[41] |
Salmivalli, C. (2010). Bullying and the peer group: A review. Aggression and Violent Behavior, 15(2), 112-120. https://doi.org/10.1016/j.avb.2009.08.007
doi: 10.1016/j.avb.2009.08.007 URL |
[42] |
Salmivalli, C. (2018). Peer victimization and adjustment in young adulthood: Commentary on the special section. Journal of Abnormal Child Psychology, 46(1), 67-72. https://doi.org/10.1007/s10802-017-0372-8
doi: 10.1007/s10802-017-0372-8 URL pmid: 29192352 |
[43] |
Schacter, H. L., & Juvonen, J. (2015). The effects of school-level victimization on self-blame: Evidence for contextualized social cognitions. Developmental Psychology, 51(6), 841-847. https://doi.org/10.1037/dev0000016
doi: 10.1037/dev0000016 URL pmid: 25893267 |
[44] | Selig, J. P., Card, N. A., & Little, T. D. (2008). Latent variable structural equation modeling in cross-cultural research: Multigroup and multilevel approaches. In F. J. R. van de Vijver, D. A. van Hemert, & Y. H. Poortinga (Eds.), Multilevel Analysis of Individuals and Cultures (pp. 93-119). Mahwah: Erlbaum |
[45] |
Sentse, M., Scholte, R., Salmivalli, C., & Voeten, M. (2007). Person-group dissimilarity in involvement in bullying and its relation with social status. Journal of Abnormal Child Psychology, 35(6), 1009-1019. https://doi.org/10.1007/s10802-007-9150-3
doi: 10.1007/s10802-007-9150-3 URL |
[46] |
Smeijers, D., Bulten, E. B. H., & Brazil, I. A. (2019). The computations of hostile biases (CHB) model: Grounding hostility biases in a unified cognitive framework. Clinical Psychology Review, 73, 101775. https://doi.org/10.1016/j.cpr.2019.101775
doi: 10.1016/j.cpr.2019.101775 URL pmid: 31726277 |
[47] | Sullivan, T. N., Farrell, A. D., & Kliewer, W. (2006). Peer victimization in early adolescence: Association between physical and relational victimization and drug use, aggression, and delinquent behaviors among urban middle school students. Development and Psychopathology, 18(01). https://doi.org/10.1017/S095457940606007X |
[48] | United Nations Educational, Scientific and Cultural Organization. (2019). Behind the numbers: Ending school violence and bullying. https://en.unesco.org/open-access/terms-use-ccbysa-en |
[49] |
Vaillancourt, T., Brittain, H. L., McDougall, P., & Duku, E. (2013). Longitudinal links between childhood peer victimization, internalizing and externalizing problems, and academic functioning: Developmental cascades. Journal of Abnormal Child Psychology, 41(8), 1203-1215. https://doi.org/10.1007/s10802-013-9781-5
doi: 10.1007/s10802-013-9781-5 URL |
[50] |
van, Lier, P. A., C., &, Koot, H., M. (2010). Developmental cascades of peer relations and symptoms of externalizing and internalizing problems from kindergarten to fourth-grade elementary school. Development and Psychopathology, 22(3), 569-582. https://doi.org/10.1017/S0954579410000283
doi: 10.1017/S0954579410000283 URL pmid: 20576179 |
[51] |
van Reemst, L., Fischer, T. F. C., & Zwirs, B. W. C. (2016). Social information processing mechanisms and victimization: A literature review. Trauma, Violence, & Abuse, 17(1), 3-25. https://doi.org/10.1177/1524838014557286
doi: 10.1177/1524838014557286 URL pmid: 25389278 |
[52] |
Verhoef, R. E. J., Alsem, S. C., Verhulp, E. E., & de Castro, B. O. (2019). Hostile intent attribution and aggressive behavior in children revisited: A meta-analysis. Child Development, 90(5). https://doi.org/10.1111/cdev.13255
doi: 10.1111/cdev.13095 URL pmid: 29884983 |
[53] |
Visconti, K. J., Kochenderfer-Ladd, B., & Clifford, C. A. (2013). Children’s attributions for peer victimization: A social comparison approach. Journal of Applied Developmental Psychology, 34(6), 277-287. https://doi.org/10.1016/j.appdev.2013.06.002
doi: 10.1016/j.appdev.2013.06.002 URL |
[54] |
Vythilingam, M., Blair, K. S., Mccaffrey, D., Scaramozza, M., Jones, M., Nakic, M., … Blair, R. J. R. (2007). Biased emotional attention in post-traumatic stress disorder: A help as well as a hindrance? Psychological Medicine, 37(10), 1445-1455. https://doi.org/10.1017/S003329170700092X
doi: 10.1017/S003329170700092X URL pmid: 17559703 |
[55] |
Wood, J. O. V. (1989). Theory and research concerning social comparisons of personal attributes. Psychological Bulletin, 106(2), 231-248.
doi: 10.1037/0033-2909.106.2.231 URL |
[56] |
Yeung, R. S., & Leadbeater, B. J. (2007). Does hostile attributional bias for relational provocations mediate the short-term association between relational victimization and aggression in preadolescence? Journal of Youth and Adolescence, 36(8), 973-983. https://doi.org/10.1007/s10964-006-9162-2
doi: 10.1007/s10964-006-9162-2 URL |
[57] |
Zeng, X. R., Wang, Y., Ding, H. H., & Zhou, H. (2019). Classroom bullying norms and bullying behavior: The mediating role of fear induced by group identity and peer pressure. Acta Psychologica Sinica, 51(8), 935-944. https://doi.org/935-944.10.3724/SP.J.1041.2019.00935
doi: 10.3724/SP.J.1041.2019.00935 URL |
[58] | Zhang, J., Pan, B., Chen, L., Li, T. F., & Zhang, W. X. (2020). Psychometric analysis of assessment of intent attributions for ambiguous provocation situations in Chinese children and adolescents. Chinese Journal of Clinical Psychology, 28(2), 94-98+196. https://doi.org/10.16128/j.cnki.1005-3611.2020.02.018 |
[59] | Zhang, W., Chen, L., & Chen, G. (2016). Research on bullying in mainland China. In P. Smith, K. Kwak, & Y. Toda. (Eds.), School bullying in different cultures: Eastern and western perspectives (pp. 113-132). Cambridge: Cambridge University Press. |
[60] | Zhang, W. X., Wu, J. F., & Jones, K. (1999). The revision of Olweus' children bullying questionnaire. Psychological Development and Education, 15(2), 7-11. |
[61] |
Zhou, Z.-K., Liu, Q.-Q., Niu, G.-F., Sun, X.-J., & Fan, C.-Y. (2017). Bullying victimization and depression in Chinese children: A moderated mediation model of resilience and mindfulness. Personality and Individual Differences, 104, 137-142. https://doi.org/10.1016/j.paid.2016.07.040
doi: 10.1016/j.paid.2016.07.040 URL |
[1] | LI Rui, XIA Ling-Xiang. The mediating effect of aggression motivation on the relationship between trait anger and reactive aggression: A longitudinal study [J]. Acta Psychologica Sinica, 2021, 53(7): 788-797. |
[2] | QIU Fanghui, LUO Yuejia, JIA Shiwei. The influence of individual aggression on categorical perception of angry expression [J]. Acta Psychologica Sinica, 2016, 48(8): 946-956. |
Viewed | ||||||
Full text |
|
|||||
Abstract |
|
|||||