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Anti-anger Effects of Herbal Medicine: A Mini-Review of Rat Studies

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Abstract

Objective

To analyze the available data on the anti-anger effects of herbal medicines (HMs) as well as their underlying mechanisms in rat models.

Methods

From 6 electronic databases [PubMed, EMBASE, China National Knowledge Infrastructure (CNKI), Wanfang, Oriental Medicine Advanced Searching Integrated System (OASIS), and Research Information Sharing Service (RISS)], relevant animal experiments were searched by using “anger,” “rats,” and “animal” as search keywords. The last search was conducted on November 22, 2019, and all experiments involving rat models of anger and treatment using HMs published until the date of the search were considered.

Results

A total of 24 studies with 16 kinds of HMs were included. Most studies have used the “tail irritating method” and “social isolation and resident intruder” method to establish anger models. According to the included studies, the therapeutic mechanisms of HMs for anger regulation and important herbs by their frequency and/or preclinical evidence mainly incladed regulation of hemorheology (Bupleuri Radix, Paeoniae Radix Alba, and Glycyrrhizae Radix), regulation of sex hormones (Bupleuri Radix, Cyperi Rhizoma, and Paeoniae Radix Alba), regulation of neurotransmitters (Cyperi Rhizoma), regulation of anger-related genes (Bupleuri Radix, Glycyrrhizae Radix, and Paeoniae Radix Alba), and other effects. Overall, Liver (Gan) qi-smoothing herbs including Bupleuri Radix and Cyperi Rhizoma were the most frequently used.

Conclusions

This review found the frequent methods to establish an anger model, and major mechanisms of anti-anger effects of HMs. Interestingly, some Liver qi-smoothing herbs have been frequently used to investigate the anti-anger effects of HM. These findings provide insight into the role and relevance of HMs in the field of anger management.

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References

  1. Dictionary OE, ed. Anger Online: Oxford University Press. Accessed July 11, 2019.

  2. Williams R. Anger as a basic emotion and its role in personality building and pathological growth: the neuroscientific, developmental and clinical perspectives. Front Psychol 2017;8:1950.

    Article  PubMed  PubMed Central  Google Scholar 

  3. Barrett EL, Mills KL, Teesson M. Mental health correlates of anger in the general population: findings from the 2007 National Survey of Mental Health and Wellbeing. Aust N Z J Psychiatry 2013;47:470–476.

    Article  PubMed  Google Scholar 

  4. Kucharska-Newton AM, Williams JE, Chang PP, et al. Anger proneness, gender, and the risk of heart failure. J Card Fail 2014;20:1020–1026.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Staicu ML, Cutov M. Anger and health risk behaviors. J Med Life 2010;3:372–375.

    PubMed  PubMed Central  Google Scholar 

  6. Sturgeon JA, Carriere JS, Kao MJ, et al. Social disruption mediates the relationship between perceived injustice and anger in chronic pain: a collaborative health outcomes information registry study. Ann Behav Med 2016;50:802–812.

    Article  PubMed  Google Scholar 

  7. Garfinkel SN, Zorab E, Navaratnam N, Engels M, Mallorqui-Bague N, Minati L, et al. Anger in brain and body: the neural and physiological perturbation of decision-making by emotion. Soc Cogn Affect Neurosci 2016;11:150–158.

    Article  PubMed  Google Scholar 

  8. Abt TP. Towards a framework for preventing community violence among youth. Psychol Health Med 2017;22:266–285.

    Article  PubMed  Google Scholar 

  9. Puskar K, Ren D, Bernardo LM, et al. Anger correlated with psychosocial variables in rural youth. Issues Compr Pediatr Nurs 2008;31:71–87.

    Article  PubMed  PubMed Central  Google Scholar 

  10. Okuda M, Picazo J, Olfson M, et al. Prevalence and correlates of anger in the community: results from a national survey. CNS Spectr 2015;20:130–139.

    Article  PubMed  PubMed Central  Google Scholar 

  11. Rosell DR, Siever LJ. The neurobiology of aggression and violence. CNS Spectr 2015;20:254–279.

    Article  PubMed  Google Scholar 

  12. Kim KW, An ES, Lee YS, et al. Neurobiology of aggression. Kor J Biol Psychiatry 2013;20:129–135.

    Google Scholar 

  13. Varghese BS, Rajeev A, Norrish M, et al. Topiramate for anger control: a systematic review. Ind J Pharmacol 2010;42:135–141.

    Article  CAS  Google Scholar 

  14. Farnam A, MehrAra A, Dadashzadeh H, et al. Studying the effect of sertraline in reducing aggressive behavior in patients with major depression. Adv Pharm Bull 2017;7:275–279.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  15. Mercer D, Douglass AB, Links PS. Meta-analyses of mood stabilizers, antidepressants and antipsychotics in the treatment of borderline personality disorder: effectiveness for depression and anger symptoms. J Pers Disord 2009;23:156–174.

    Article  PubMed  Google Scholar 

  16. Fernandez E, Malvaso C, Day A, et al. 21st century cognitive behavioural therapy for anger: a systematic review of research design, methodology and outcome. Behav Cogn Psychother 2018;46:385–404.

    Article  PubMed  Google Scholar 

  17. Chang D, Hwang S. The development of anger management program based on acceptance and commitment therapy for youth taekwondo players. J Exerc Rehabil 2017;13:160–167.

    Article  PubMed  PubMed Central  Google Scholar 

  18. Kiran U, Ladha S. Anger: an enemy of heart, raj yoga meditation is heart friendly. Ann Card Anaesth 2017;20:127–128.

    Article  PubMed  PubMed Central  Google Scholar 

  19. Hirano M, Yukawa S. The impact of mindfulness meditation on anger. Jpn J Psychiat 2013;84:93–102.

    Google Scholar 

  20. Anderson CA, Bushman BJ, Bartholow BD, et al. Screen violence and youth behavior. Pediatrics 2017;140:S142–S147.

    Article  PubMed  Google Scholar 

  21. Pullen L, Modrcin MA, McGuire SL, et al. Anger in adolescent communities: how angry are they? Pediatr Nurs 2015;41:135–140.

    PubMed  Google Scholar 

  22. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 4th ed. Washington D.C: American Psychiatric Press;2000:897–903.

    Google Scholar 

  23. The Korean Society of Oriental Neuropsychiatry and Hwabyung Research Center. Clinical Guidelines for Hwabyung. 1st ed. Seoul: Jipmoondang; 2013.

    Google Scholar 

  24. Suh JW, Chung SY, Kim SY, et al. Anxiety and anger symptoms in hwabyung patients improved more following 4 weeks of the emotional freedom technique program compared to the progressive muscle relaxation program: a randomized controlled trial. Evid Based Complement Alternat Med 2015;2015:203612.

    Article  PubMed  PubMed Central  Google Scholar 

  25. The Korean Society of Oriental Neuropsychiatry. Korean Medicine Clinical Practice Guideline for Hwabyung. 2nd ed. Seoul: The Korean Society of Oriental Neuropsychiatry; 2016:3–9.

    Google Scholar 

  26. Kim YR, Chung SY, Choi EJ, et al. The effects of acupuncture and herbal medicine for the treatment of whabyung: a meta-analysis. Kor J Clin Pharm 2017;27:267–275.

    Article  Google Scholar 

  27. Xu H, Fu X, Xiang L, et al. Animal experimental study of Liver depression syndrome—effect of irritating stimulation on hemorheology in rats. J Tradit Chin Med 1991;6:44–47.

    Google Scholar 

  28. Wang X, Huang B, Zhang G, et al. Endocrine changes in irritated female rats and the intervention of traditional Chinese medicine. J Sichuan Tradit Chin Med (Chin) 2003;21:9–10.

    Google Scholar 

  29. Huang B, Wang X, Miao L, et al. Intervention of traditional Chinese medicine Shugan Tiaojing II on endocrine of irritated female rats. Tradit Chin Med Res (Chin) 2005;18:18–19.

    Google Scholar 

  30. Xu L, Liu X, Dong Q, et al. Effect of Tian Ma Gou Teng Decoction on contents of monoamine neurotransmitter and their metabolite in hypothalamus of rats with anger stress. J Sichuan Tradit Chin Med (Chin) 2006;24:10–12.

    Google Scholar 

  31. Zhai YQ. Adjustment of the prescription of stretching-Liver and replenishing-Kidney on the worried and angry rats’ changes of FSH, LH, ER of pituitary body [Dissertation]. Zhengzhou: Henan University of Traditional Chinese Medicine;2007.

    Google Scholar 

  32. Ge QF, Zhang HY. Effects of Chinese herbal medicines for regulating Liver qi on expression of 5-hydroxytryptamine 3B receptor in hypothalamic tissues of rats with anger emotion. J Chin Integr Med 2011;9:871–877.

    Article  Google Scholar 

  33. Guo YH, Gao J, Xu KY, et al. Effect of Jingqianshu Granule on gene expression profile in the hippocampal of the anger-in rat model. Chin Pharmacol Bull 2011;27:1317–1321.

    Google Scholar 

  34. Li H. Experimental study on 5-HTR3B expression levels and the content of 5-HT in different brain regions of model rats with anger-in [Dessertation]. Jinan: Shandong University of Traditional Chinese Medicine;2011.

    Google Scholar 

  35. Gao J, Guo Y, Song C, et al. Effect of Tiaogan Recipe on expression of y -aminobutyric acid B2 receptor in hippocampus of rats with anger-out and anger-in model. Proceedings of the Fifth Academic Annual Meeting of the Basic Theoretical Branch of Chinese Medicine of the Chinese Academy of Chinese Medicine. Xianyang, Shaanxi; 2011:204–207.

  36. Geng YN. Effects of Jingqianping Granule on the expression of GABABR2 of anger-out model rats and construction of GABABR2 [Dissertation]. Jinan: Shandong University of Traditional Chinese Medicine;2011.

    Google Scholar 

  37. Gao P, Zhang H. Effect of Tiaogan Recipe on expression of 5-HTR2C gene in hypothalamus of rats with anger-out and anger-in. Chin J Exp Tradit Med Formul (Chin) 2011;17:120–124.

    Google Scholar 

  38. Cui W. Expressions of 5-HTR2C in different brain regions of the model rats with anger-out or anger-in and effects of Liver-regulating Compound Recipe [Dissertation]. Jinan: Shandong University of Traditional Chinese Medicine;2011.

    Google Scholar 

  39. Jiang Y, Xue L. Effect of Jingqianping Granules and Jingqianshu Granules on expression of hypothalamic y -aminobutyric acid B2 receptor in emotional rats models of anger-out and anger-in. Tradit Chin Drug Res Clin Pharmacol (Chin) 2011;22:474–478.

    Google Scholar 

  40. Guo YH, Wei S, Gao J, et al. Effect of Jingqianping Granule on gene expression profile in the hippocampus of the anger-out rat model. Chin Pharmacol Bull 2012;28:1324–1328.

    Google Scholar 

  41. Zong SH, Wei S, Sun P, et al. Effect of Jingqianping Granule on monoamine neurotransmitters in different brain regions of anger-out model rats. Chin Pharmacol Bull (Chin) 2012;28:1615–1619.

    Google Scholar 

  42. Xu LL, Cai HX, Gao J, et al. Effect of Baixiangdan Capsule on expression of GABABR and KIR in hippocampus of anger-out rat models. Tradit Chin Drug Res Clin Pharmacol (Chin) 2012;23:267–270.

    Google Scholar 

  43. Zhou L, Liu W, Wang LJ, et al. Influence of chronic enraged stress on gastric motility and brain-gut peptides in rats and the interfering effec of Chaihu Shugan Powder. J Tradit Chin Med (Chin) 2012;53:775–777,787.

    Google Scholar 

  44. Liu X, Xue L. Effect of Jingqianping Granule on expression of 5-HTR2C in rat cerebral cortex with anger emotion. Chin J Tradit Chin Med Pharm (Chin) 2012;27:1248–1252.

    CAS  Google Scholar 

  45. Zhang Z. The effect of Tian Bing Tiao Du Capsule on emotional behaviors and spatial memory capacity and somatostatin of enraged rats with syndrome of stagnation of the Liver-qi model [Dissertation]. Shijiazhuang: Hebei University; 2012.

    Google Scholar 

  46. Yu X, Wang J. Effect of Dan’e Fukang Cream on contents of dopamine, norepinephrine and serotonin in hypothalamus of anger-out model rats. Guid Chin Med (Chin) 2013;11:94–95.

    Google Scholar 

  47. Yin YH, Wang XY, Yang SH. Effect of Soothing Liver and Dropping Lung on hippocampus neurotransmitter and estrogen receptor β in the uterus and ovary of “anger” injured rats. Zhejiang J Integr Tradit Chin West Med (Chin) 2016;26:795–797,800.

    Google Scholar 

  48. Xu M, Ni H, He Y, et al. Effects of Ganmai Dazao Decoction on behavior characteristics in rat model of ‘anger’. Chin J Tradit Chin Med Pharm (Chin) 2017;32:2736–2739.

    Google Scholar 

  49. Yang JP, Wang Y, Xiao L. The mechanism of Chaihu Shugan Powder regulating the signal transduction pathway in rats with “angry injury Liver”. Int J Lab Med 2018;39:3002–3005.

    CAS  Google Scholar 

  50. Xu YM, Zhang L, Xiao Q, et al. Effects of 919 syrup on ghrelin pathway in hypothalamus and stomach in rats with Liver-depression, qi-stagnation and blood-stasis syndrome. Shanghai J Tradit Chin Med (Chin) 2019;53:76–83.

    Google Scholar 

  51. Koudouovoh-Tripp P, Sperner-Unterweger B. Influence of mental stress on platelet bioactivity. World J Psychiatry 2012;2:134–147.

    Article  PubMed  PubMed Central  Google Scholar 

  52. Matsuhisa F, Kitamura N, Satoh E. Effects of acute and chronic psychological stress on platelet aggregation in mice. Stress 2014;17:186–192.

    Article  CAS  PubMed  Google Scholar 

  53. Harrison P, Keeling D. Platelet hyperactivity and risk of recurrent thrombosis. J Thromb Haemost 2006;4:2544–2546.

    Article  CAS  PubMed  Google Scholar 

  54. Wenneberg SR, Schneider RH, Walton KG, et al. Anger expression correlates with platelet aggregation. Behav Med 1997;22:174–177.

    Article  CAS  PubMed  Google Scholar 

  55. Stampfli SF, Camici GG, Keller S, et al. Restraint stress enhances arterial thrombosis in vivo—role of the sympathetic nervous system. Stress 2014;17:126–132.

    Article  CAS  PubMed  Google Scholar 

  56. Chang WC, Hsu FL. Inhibition of platelet activation and endothelial cell injury by flavan-3-ol and saikosaponin compounds. Prostaglandins Leukot Essent Fat Acids 1991;44:51–56.

    Article  CAS  Google Scholar 

  57. Yang Q, Yang L, Xiong A, et al. Metabolomics study of anti-platelet effect of Radix Paeoniae Rubra and Radix Paeoniae Alba by UPLC-MS. China J Chin Mater Med (Chin) 2011;36:698–701.

    Google Scholar 

  58. Tawata M, Aida K, Noguchi T, et al. Anti-platelet action of isoliquiritigenin, an aldose reductase inhibitor in licorice. Eur J Pharmacol 1992;212:87–92.

    Article  CAS  PubMed  Google Scholar 

  59. Batrinos ML. Testosterone and aggressive behavior in man. Int J Endocrinol Metab 2012;10:563–568.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  60. Peterson CK, Harmon-Jones E. Anger and testosterone: evidence that situationally-induced anger relates to situationally-induced testosterone. Emotion 2012;12:899–902.

    Article  PubMed  Google Scholar 

  61. Romero-Martinez A, Gonzalez-Bono E, Lila M, et al. Testosterone/cortisol ratio in response to acute stress: a possible marker of risk for marital violence. Soc Neurosci 2013;8:240–247.

    Article  CAS  PubMed  Google Scholar 

  62. Romero-Martinez A, Moya-Albiol L. The use of testosterone/cortisol ratio in response to acute stress as an indicator of propensity to anger in informal caregivers. Span J Psychol 2016;19:1–10.

    Article  Google Scholar 

  63. Denson TF, O’Dean SM, Blake KR, et al. Aggression in women: behavior, brain and hormones. Front Behav Neurosci 2018;12:81.

    Article  PubMed  PubMed Central  Google Scholar 

  64. Eisenlohr-Moul TA, DeWall CN, Girdler SS, et al. Ovarian hormones and borderline personality disorder features: preliminary evidence for interactive effects of estradiol and progesterone. Biol Psychol 2015;109:37–52.

    Article  PubMed  PubMed Central  Google Scholar 

  65. Ogawa S, Eng V, Taylor J, et al. Roles of estrogen receptor-alpha gene expression in reproduction-related behaviors in female mice. Endocrinology 1998;139:5070–5081.

    Article  CAS  PubMed  Google Scholar 

  66. Tsuda MC, Yamaguchi N, Nakata M, et al. Modification of female and male social behaviors in estrogen receptor beta knockout mice by neonatal maternal separation. Front Neurosci 2014;8:1–9.

    Article  Google Scholar 

  67. Trainor BC, Greiwe KM, Nelson RJ. Individual differences in estrogen receptor alpha in select brain nuclei are associated with individual differences in aggression. Horm Behav 2006;50:338–345.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  68. Joseph DN, Whirledge S. Stress and the HPA axis: balancing homeostasis and fertility. Int J Mol Sci 2017;18:1–15.

    Article  Google Scholar 

  69. Li HY, Zhao YH, Zeng MJ, et al. Saikosaponin D relieves unpredictable chronic mild stress-induced depressive-like behavior in rats: involvement of HPA axis and hippocampal neurogenesis. Psychopharmacology (Berl) 2017;234:3385–3394.

    Article  CAS  Google Scholar 

  70. Kim HG, Hong J, Huh Y, et al. Cyperi Rhizoma inhibits the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced reduction in nigrostriatal dopaminergenic neurons in estrogen-deprived mice. J Ethnopharmacol 2013;148:322–328.

    Article  CAS  PubMed  Google Scholar 

  71. Xu Y, Li X, Chen T, et al. Radix Paeoniae Alba increases serum estrogen level and up-regulates estrogen receptor expression in uterus and vagina of immature/ovariectomized mice. Phytother Res 2019;33:117–129.

    Article  CAS  PubMed  Google Scholar 

  72. Yanowitch R, Coccaro EF. The neurochemistry of human aggression. Adv Genet 2011;75:151–169.

    Article  CAS  PubMed  Google Scholar 

  73. Narvaes R, Martins de Almeida RM. Aggressive behavior and three neurotransmitters: dopamine, GABA, and serotonin—a review of the last 10 years. Psychol Neurosci 2014;7:601.

    Article  Google Scholar 

  74. Temel Y, Helmy A, Pinnock S, et al. Effect of serotonin depletion on the neuronal, endocrine and behavioural responses to corticotropin-releasing factor in the rat. Neurosci Lett 2003;338:139–142.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  75. Texel SJ, Camandola S, Ladenheim B, et al. Ceruloplasmin deficiency results in an anxiety phenotype involving deficits in hippocampal iron, serotonin, and BDNF. J Neurochem 2012;120:125–134.

    Article  CAS  PubMed  Google Scholar 

  76. Wingrove J, Bond AJ, Cleare AJ, et al. Trait hostility and prolactin response to tryptophan enhancement/depletion. Neuropsychobiology 1999;40:202–206.

    Article  CAS  PubMed  Google Scholar 

  77. Cleare AJ, Bond AJ. Does central serotonergic function correlate inversely with aggression? A study using D-fenfluramine in healthy subjects. Psychiatry Res 1997;69:89–95.

    Article  CAS  PubMed  Google Scholar 

  78. Doudet D, Hommer D, Higley JD, et al. Cerebral glucose metabolism, CSF 5-HIAA levels, and aggressive behavior in rhesus monkeys. Am J Psychiatry 1995;152:1782–1787.

    Article  CAS  PubMed  Google Scholar 

  79. Lieberman HR, Thompson LA, Caruso CM, et al. The catecholamine neurotransmitter precursor tyrosine increases anger during exposure to severe psychological stress. Psychoharmacology (Berl) 2015;232:943–951.

    Article  CAS  Google Scholar 

  80. Huband N, Ferriter M, Nathan R, et al. Antiepileptics for aggression and associated impulsivity. Cochrane Database Syst Rev 2010:CD003499.

  81. Stanford MS, Anderson NE, Lake SL, et al. Pharmacologic treatment of impulsive aggression with antiepileptic drugs. Curr Treat Options Neurol 2009;11:383–390.

    Article  PubMed  Google Scholar 

  82. Ende G, Cackowski S, van Eijk J, et al. Impulsivity and aggression in female BPD and ADHD patients: association with ACC glutamate and GABA concentrations. Neuropsychopharmacology 2016;41:410–418.

    Article  CAS  PubMed  Google Scholar 

  83. Stan AD, Schirda CV, Bertocci MA, et al. Glutamate and GABA contributions to medial prefrontal cortical activity to emotion: implications for mood disorders. Psychiatry Res 2014;223:253–260.

    Article  PubMed  Google Scholar 

  84. Brohan J, Goudra BG. The role of GABA receptor agonists in anesthesia and sedation. CNS Drugs 2017;31:845–856.

    Article  CAS  PubMed  Google Scholar 

  85. Blair RJR. Considering anger from a cognitive neuroscience perspective. Wiley Interdiscip Rev Cogn Sci 2012;3:65–74.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  86. Sim Y, Choi JG, Gu PS, et al. Identification of neuroactive constituents of the ethyl acetate fraction from Cyperi Rhizoma using bioactivity-guided fractionation. Biomol Ther 2016;24:438–445.

    Article  CAS  Google Scholar 

  87. Wu S, Guo L, Qiu F, et al. Anti-migraine effect of the herbal combination of Chuanxiong Rhizoma and Cyperi Rhizoma and UPLC-MS/MS method for the simultaneous quantification of the active constituents in rat serum and cerebral cortex. Molecules 2019;24:2230.

    Article  CAS  PubMed Central  Google Scholar 

  88. Guo Y, Zhang H, Gao J, et al. Study of genes associated with the’ anger-in’ and’ anger-out’ emotions of humans using a rat model. Exp Ther Med 2015;9:1448–1454.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  89. Fernandez-Castillo N, Cormand B. Aggressive behavior in humans: genes and pathways identified through association studies. Am J Med Genet B Neuropsychiatr Genet 2016;171:676–696.

    Article  CAS  PubMed  Google Scholar 

  90. Li XH, Zhou XM, Li XJ, et al. Effects of Xiaoyaosan on the hippocampal gene expression profile in rats subjected to chronic immobilization stress. Front Psychiatry 2019;10:178–178.

    Article  PubMed  PubMed Central  Google Scholar 

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Contributions

CYK and HWS participated in the literature search, study selection and data extraction. CYK and HWS described the manuscript. JWK and SYC supervised the study design and critically reviewed the manuscript. All authors participated in the analysis and interpretation of data and approved the final version for publication.

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Correspondence to Sun-Yong Chung.

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The authors declare that there are no conflicts of interest regarding the publication of this article.

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Supported by the Grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute, Funded by the Ministry of Health & Welfare, Republic of Korea (No. HF20C0079)

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Kwon, CY., Suh, HW., Kim, J.W. et al. Anti-anger Effects of Herbal Medicine: A Mini-Review of Rat Studies. Chin. J. Integr. Med. 28, 263–271 (2022). https://doi.org/10.1007/s11655-022-3506-3

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