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Ultrasound imaging of maternal birth trauma

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International Urogynecology Journal Aims and scope Submit manuscript

Abstract

Introduction and hypothesis

The term ‘maternal birth trauma’ has undergone substantial changes in meaning over the last 2 decades. Leaving aside psychological morbidity, somatic trauma is now understood to encompass not just episiotomy, perineal tears and obstetric anal sphincter injuries (OASI), but also trauma to the levator ani muscle. This review covers diagnosis of maternal birth trauma by translabial ultrasound imaging.

Methods

Narrative review.

Results

Tomographic imaging of pelvic structures with the help of 4D ultrasound, used since 2007, has allowed international standardization and seems to be highly reproducible and valid for the diagnosis of OASI and levator avulsion.

Conclusions

Translabial and exo-anal ultrasound allows the assessment of maternal birth trauma in routine clinical practice and the utilization of avulsion and sphincter trauma as key performance indicators of maternity services. It is hoped that this will lead to a greater awareness of maternal birth trauma among maternity caregivers and improved outcomes for patients, both in the short term and in the decades to come.

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References

  1. Dietz H, Campbell S. Toward normal birth—but at what cost? Am J Obstet Gynecol. 2016;215(4):439–44.

    Article  PubMed  Google Scholar 

  2. Skinner E, Barnett B, Dietz H. Psychological consequences of pelvic floor trauma following vaginal birth: a qualitative study from two Australian tertiary maternity units. Archives of Women’s Mental Health. 2018;21(3):341–51.

    Article  PubMed  Google Scholar 

  3. Mant J, Painter R, Vessey M. Epidemiology of genital prolapse: observations from the Oxford family planning association study. Br J Obstet Gynaecol. 1997;104(5):579–85.

    Article  CAS  PubMed  Google Scholar 

  4. Swift S, et al. Pelvic organ support study (POSST): the distribution, clinical definition, and epidemiologic condition of pelvic organ support defects. Am J Obstet Gynecol. 2005;192(3):795–806.

    Article  PubMed  Google Scholar 

  5. Hendrix S, et al. Pelvic organ prolapse in the Women’s Health Initiative: gravity and gravidity. Am J Obstet Gynecol. 2002;186:1160–6.

    Article  PubMed  Google Scholar 

  6. Rortveit G, et al. Age- and type-dependent effects of parity on urinary incontinence: the Norwegian EPINCONT study. Obstet Gynecol. 2001;98(6):1004–10.

    CAS  PubMed  Google Scholar 

  7. Dietz H, Wilson P, Milsom I. Maternal birth trauma: why should it matter to urogynaecologists? Courr Opin O/G. 2016;28(5):441–8.

    Article  Google Scholar 

  8. Blomquist J, et al. Association of Delivery Mode with Pelvic Floor Disorders after Childbirth. JAMA. 2018;320(23):2438–47.

    Article  PubMed  PubMed Central  Google Scholar 

  9. Shek K, Kruger J, Dietz H. The effect of pregnanct on hiatal dimenions and urethral mobility: an observational study. Int Urogynecol J. 2012;23:1561–7.

    Article  PubMed  Google Scholar 

  10. Dietz H, Tekle H, Williams G. Pelvic floor structure and function in women with vesicovaginal fistula. J Urol. 2010;188(5):1772–7.

    Article  Google Scholar 

  11. Cassado Garriga J, et al. Can we identify changes in fascial paravaginal supports after childbirth? Aust NZ J Obstet Gynaecol. 2015;55:70–5.

    Article  Google Scholar 

  12. Guzman Rojas R, et al. Does childbirth play a role in the etiology of rectocele? Int Urogynecol J. 2015;26(5):737–41.

    Article  PubMed  Google Scholar 

  13. Taithongchai A, et al. Comparing the diagnostic accuracy of 3 ultrasound modalities for diagnosing obstetric anal sphincter injuries. Am J Obstet Gynecol. 2019;221(2):134.e1–9.

    Article  Google Scholar 

  14. Meriwether K, et al. Anal sphincter anatomy Prepregnancy to Postdelivery among the same Primiparous women on dynamic magnetic resonance imaging. Female Pelvic Med Reconstr Surg. 2019;25(1):8–14.

    Article  PubMed  PubMed Central  Google Scholar 

  15. Peschers UM, et al. Exoanal ultrasound of the anal sphincter: normal anatomy and sphincter defects. Br.J.Obstet.Gynaecol. 1997;104(9):999–1003.

    Article  CAS  PubMed  Google Scholar 

  16. Stuart A, Ignell C, Orno A. Comparison of transperineal and endoanal ultrasound in detecting residual obstetric anal sphincter injury. Acta Obstet Gynecol Scand. 2019;98(12):1624–31.

    Article  PubMed  Google Scholar 

  17. Dietz H. Exo-anal imaging of the anal sphincters: a pictorial introduction. J Ultrasound Med. 2018;2018:263–80.

    Article  Google Scholar 

  18. Cattani L, et al. Exo-anal imaging of the anal sphincter: a comparison between introital and transperineal image acquisition. Int Urogynecol J. 2020;31:1107–13.

    Article  PubMed  Google Scholar 

  19. Subramaniam N, Robledo K, Dietz H. Anal sphincter imaging: better done at rest or on pelvic floor muscle contraction? Int Urogynecol J. 2020;31(6):1191–6.

    Article  PubMed  Google Scholar 

  20. Housmans S, et al. The appearance of perineal trauma on translabial ultrasound. Ultrasound Obstet Gynecol. 2019;53(S1):85–6.

    Article  Google Scholar 

  21. Subramaniam N, Shek K, Dietz H. Imaging characteristics of episiotomy scars on Translabial ultrasound. Int Urogynecol J, 2020. 54(S1): in print.

  22. Andrews A, et al. Occult anal sphincter injuries- myth or reality? BJOG. 2006;113:195–200.

    Article  PubMed  Google Scholar 

  23. Guzman Rojas R, et al. Prevalence of anal sphincter injury in primiparous women. Ultrasound Obstet Gynecol. 2013;42(4):461–6.

    CAS  PubMed  Google Scholar 

  24. Guzman Rojas R, Salvesen K, Volloyhaug I. Anal sphincter defects and fecal incontinence 15-24 years after first delivery: a cross-sectional study. Ultrasound Obstet Gynecol. 2018;51(5):677–83.

    Article  CAS  PubMed  Google Scholar 

  25. Rojas G. R., et al., anal sphincter trauma and anal incontinence in urogynecological patients. Ultrasound Obstet Gynecol. 2015;46:363–6.

    Article  Google Scholar 

  26. Subramaniam N, Dietz H. What is a significant defect of the anal sphincter? Ultrasound Obstet Gynecol. 2020;55:411–5.

    Article  CAS  PubMed  Google Scholar 

  27. Gillor M, Shek K, Dietz H How comparable is the clinical grading of obstetric anal sphincter injury with that determined by four-dimensional translabial ultrasound? Ultrasound Obstet Gynecol, 2020. in print.

  28. Gillor M, Shek K. And H. Dietz how comparable is the clinical grading of obstetric anal sphincter injury with that determined by four-dimensional translabial ultrasound. Ultrasound Obstet Gynecol. 2020;56(4):618–23.

    Article  CAS  PubMed  Google Scholar 

  29. Subramaniam N, Shek K, Dietz H. Imaging characteristics of episiotomy scars on Translabial ultrasound. Ultrasound Obstet Gynecol. 2020;56(S1):374.

    Article  Google Scholar 

  30. Dietz HP. The role of two- and three-dimensional dynamic ultrasonography in pelvic organ prolapse. J Minim Invasive Gynecol. 2010;17:282–94.

    Article  PubMed  Google Scholar 

  31. Lien KC, et al. Levator ani muscle stretch induced by simulated vaginal birth. Obstet Gynecol. 2004;103(1):31–40.

    Article  PubMed  PubMed Central  Google Scholar 

  32. Svabik K, Shek K, Dietz H. How much does the levator hiatus have to stretch during childbirth? Br J Obstet Gynaecol. 2009;116:1657–62.

    Article  CAS  Google Scholar 

  33. Gainey HL. Post-partum observation of pelvic tissue damage. Am J Obstet Gynecol. 1943;46:457–66.

    Article  Google Scholar 

  34. Kearney R, et al. Obstetric factors associated with levator ani muscle injury after vaginal birth. Obstet Gynecol. 2006;107(1):144–9.

    Article  PubMed  PubMed Central  Google Scholar 

  35. Tunn R, et al. MR imaging of levator ani muscle recovery following vaginal delivery. Int Urogynecol J. 1999;10(5):300–7.

    Article  CAS  Google Scholar 

  36. Dietz H, Lanzarone V. Levator trauma after vaginal delivery. Obstet Gynecol. 2005;106:707–12.

    Article  PubMed  Google Scholar 

  37. Dietz HP, Steensma AB. The prevalence of major abnormalities of the levator ani in urogynaecological patients. BJOG Int J Obstet Gynaecol. 2006;113(2):225–30.

    Article  CAS  Google Scholar 

  38. Dietz H, Gillespie A, Phadke P. Avulsion of the pubovisceral muscle associated with large vaginal tear after normal vaginal delivery at term. Aust NZ J Obstet Gynaecol. 2007;47:341–4.

    Article  Google Scholar 

  39. Wallner C, et al. A high resolution 3D study of the female pelvis reveals important anatomical and pathological details of the pelvic floor. Neurourol Urodyn. 2009;28(7):668–70.

    Google Scholar 

  40. Dietz H, Lanzarone V. Levator trauma after vaginal delivery. Obstet Gynecol. 2005;106(4):707–12.

    Article  PubMed  Google Scholar 

  41. Valsky DV, et al. Fetal head circumference and length of second stage of labor are risk factors for levator ani muscle injury, diagnosed by 3-dimensional transperineal ultrasound in primiparous women. Am J Obstet Gynecol. 2009;201:91.e1–7.

    Article  Google Scholar 

  42. Shek K, Dietz H. Intrapartum risk factors of levator trauma. Br J Obstet Gynaecol. 2010;117:1485–92.

    Article  CAS  Google Scholar 

  43. Chan SSC, CR, Yiu AKW, Lee LLL, Pang AWL, CHoy KW, Leung TY, Chung TKH, Prevalence of levator ani muscle injury in Chinese women after first delivery. UOG, 2012; 39:704–709.

  44. Durnea C, et al. The status of the pelvic floor in young primiparous women. Ultrasound Obstet Gynecol. 2014. https://doi.org/10.1002/uog.14711.

  45. Kamisan Atan I, et al. Does the epi-no birth trainer prevent vaginal birth-related pelvic floor trauma? A multicentre prospective randomised controlled trial. BJOG. 2016;123(6):995–1003.

    Article  CAS  PubMed  Google Scholar 

  46. Abdool Z, Lindeque B, HP D. The impact of childbirth on pelvic floor morphology in primiparous black south African women: a prospective longitudinal observational study. Int Urogynecol J. 2018;29(3):369–75.

    Article  PubMed  Google Scholar 

  47. Caudwell-Hall J, et al. Can pelvic floor trauma be predicted antenatally? Acta Obstet Gynecol Scand. 2018;97(6):751–7.

    Article  PubMed  Google Scholar 

  48. Turel F, Caagbay D, Dietz H. The prevalence of major birth trauma in Nepali women. J Ultrasound Med. 2018;37:2803–9.

    Article  PubMed  Google Scholar 

  49. Chan S, et al. Pelvic floor biometry in Chinese primiparous women 1 year after delivery : a prospective observational study. Ultrasound Obstet Gynecol. 2014;43:466–74.

    Article  CAS  PubMed  Google Scholar 

  50. Friedman T, Eslick G, HP D. Delivery mode and the risk of levator muscle avulsion: a meta-analysis. Int Urogynecol J. 2019;30:901–7.

    Article  PubMed  Google Scholar 

  51. Krofta L, et al. Pubococcygeus-puborectalis trauma after forceps delivery: evaluation of the levator ani muscle with 3D/4D ultrasound. Int Urogynecol J. 2009;20:1175–81.

    Article  Google Scholar 

  52. Ortega I et al. Kielland Rotational forceps: is it safe for the mother?, in EUGA 11th anual congress. 2018: Milan.

  53. Shek K, et al. Perineal and vaginal tears are clinical markers for occult levator ani trauma: a retrospective observational study. Ultrasound Obstet Gynecol. 2016;47(2):224–7.

    Article  CAS  PubMed  Google Scholar 

  54. Valsky D, et al. Third- or fourth-degree intrapartum anal sphincter tears are associated with levator ani avulsion in primiparas. J Ultrasound Med. 2016;35(4):709–15.

    Article  PubMed  Google Scholar 

  55. Kimmich N, et al. Prediction of levator ani muscle avulsion by genital tears after vaginal birth—a prospective observational cohort study. Int Urogynecol J. 2020:2361–6.

  56. Branham V, et al. Levator ani abnormality 6 weeks after delivery persists at 6 months. Am J Obstet Gynecol. 2007;197(1):65.e1–6.

    Article  Google Scholar 

  57. Shek K, et al. Does levator trauma ‘heal’? Ultrsound Obstet Gynecol. 2012;40:570–5.

    Article  CAS  Google Scholar 

  58. Van Delft K, et al. Levator hematoma at the attachment zone as an early marker for levator ani muscle avulsion. Ultrasound Obstet Gynecol. 2014;43(2):210–7.

    Article  PubMed  Google Scholar 

  59. Chan S, et al. Longitudinal follow-up of levator ani muscle avulsion: does a second delivery affect it? Ultrasound Obstet Gynecol. 2017;50(1):110–5.

    Article  CAS  PubMed  Google Scholar 

  60. Dietz H. Ultrasound imaging of the pelvic floor: 3D aspects. Ultrasound Obstet Gynecol. 2004;23(6):615–25.

    Article  CAS  PubMed  Google Scholar 

  61. Shek K, et al. Perineal and vaginal tears are clinical markers for occult levator ani trauma: a retrospective observational study. Ultrasound Obstet Gynecol. 2016;47:224–7.

    Article  CAS  PubMed  Google Scholar 

  62. Kearney R, Miller JM, Delancey JO. Interrater reliability and physical examination of the pubovisceral portion of the levator ani muscle, validity comparisons using MR imaging. Neurourology & Urodynamics. 2006;25(1):50–4.

    Article  Google Scholar 

  63. Dietz HP, Shek KL. Validity and reproducibility of the digital detection of levator trauma. Int Urogynecol J. 2008;19:1097–101.

    Article  CAS  Google Scholar 

  64. Dietz HP, Shek KL. Levator defects can be diagnosed by 2D translabial ultrasound. Int Urogynecol J. 2009;20:807–11.

    Article  CAS  Google Scholar 

  65. Adisuroso T, Shek K, Dietz H. Tomographic imaging of the pelvic floor in nulliparous women: limits of normality. Ultrasound Obstet Gynecol. 2012;39(6):698–703.

    Article  CAS  PubMed  Google Scholar 

  66. Dietz H, Moegni F, Shek K. Diagnosis of Levator avulsion injury: a comparison of three methods. Ultrasound Obstet Gynecol. 2012;40(6):693–8.

    Article  CAS  PubMed  Google Scholar 

  67. Tan L, et al. The repeatability of sonographic measures of functional pelvic floor anatomy. Int Urogynecol J. 2015;26:1667–72.

    Article  PubMed  Google Scholar 

  68. Zhuang R, et al. Levator avulsion using a tomographic ultrasound and magnetic resonance–based model. Am J Obstet Gynecol. 2011;205:232.e1-8.

    Article  PubMed  Google Scholar 

  69. Calderwood CS, et al. Comparing 3-dimensional ultrasound to 3-dimensional magnetic resonance imaging in the detection of Levator Ani defects. Female Pelvic Medicine & Reconstructive Surgery. 2018;24(4):295–300.

    Article  Google Scholar 

  70. Dietz H, et al. Minimal criteria for the diagnosis of avulsion of the puborectalis muscle by tomographic ultrasound. Int Urogynecol J. 2011;22(6):699–704.

    Article  PubMed  Google Scholar 

  71. N.N. AIUM/IUGA practice parameter for the performance of Urogynecological ultrasound examinations : developed in collaboration with the ACR, the AUGS, the AUA, and the SRU. Int Urogynecol J. 2019;30(9):1389–400.

    Article  Google Scholar 

  72. Dietz, H. Pelvic Floor Imaging Online Course. 2019 [cited 2020 26.6.2020]; Available from: https://www.iuga.org/education/pfic/pfic-overview.

  73. van Delft K, et al. Does the prevalence of levator ani muscle avulsion differ when assessed using tomographic ultrasound imaging at rest vs on maximum pelvic floor muscle contraction? Ultrasound Obstet Gynecol. 2015;46(1):99–103.

    Article  PubMed  Google Scholar 

  74. Dietz H, Pattillo Garnham A, Guzmán Rojas R. Diagnosis of levator avulsion: is it necessary to perform TUI on pelvic floor muscle contraction? Ultrasound Obstet Gynecol. 2017;49:252–6.

    Article  CAS  PubMed  Google Scholar 

  75. Dietz H, Abbu A, Shek K. The Levator urethral gap measurement: a more objective means of determining levator avulsion? Ultrasound Obstet Gynecol. 2008;32:941–5.

    Article  CAS  PubMed  Google Scholar 

  76. Abdool Z, Shek K, Dietz H. The effect of levator avulsion on hiatal dimensions and function. Am J Obstet Gynecol. 2009;201:89.e1–5.

    Article  Google Scholar 

  77. Shek K, Dietz H. The effect of childbirth on hiatal dimensions: a prospective observational study. Obstet Gynecol. 2009;113:1272–8.

    Article  PubMed  Google Scholar 

  78. DeLancey J, et al. Comparison of levator ani muscle defects and function in women with and without pelvic organ prolapse. Obstet Gynecol. 2007;109(2):295–302.

    Article  PubMed  Google Scholar 

  79. Dietz HP, Shek C. Levator avulsion and grading of pelvic floor muscle strength. Int Urogynecol J. 2008;19(5):633–6.

    Article  CAS  Google Scholar 

  80. Dietz H, Simpson J. Levator trauma is associated with pelvic organ prolapse. Br J Obstet Gynaecol. 2008;115:979–84.

    Article  CAS  Google Scholar 

  81. Volloyhaug I, Morkved S, Salvesen K. Association between pelvic floor muscle trauma and pelvic organ prolapse 20 years after delivery. Int Urogynecol J. 2016;27(1):39–45.

    Article  PubMed  Google Scholar 

  82. Handa V, et al. Pelvic organ prolapse as a function of levator ani avulsion, hiatus size, and strength. Am J Obstet Gynecol. 2019;221:41.e1–7.

    Article  Google Scholar 

  83. Friedman T, Eslick G, Dietz H. Risk factors for prolapse recurrence- systematic review and meta- analysis. Int Urogynecol J. 2018;29(1):13–21.

    Article  PubMed  Google Scholar 

  84. Dietz H. Mesh in prolapse surgery: an imaging perspective. Ultrasound Obstet Gynecol. 2012;40:495–503.

    Article  CAS  PubMed  Google Scholar 

  85. Dietz H, et al. Does avulsion of the puborectalis muscle affect bladder function? Int Urogynecol J. 2009;20:967–72.

    Article  CAS  Google Scholar 

  86. Heilbrun M, et al. Correlation between levator ani muscle injuries on magnetic resonance imaging and fecal incontinence, pelvic organ prolapse, and urinary incontinence in primiparous women. Am J Obstet Gynecol. 2010;202:488.e1-6.

    Article  PubMed  Google Scholar 

  87. Chantarasorn, V., K. Shek and H. Dietz, Sonographic detection of puborectalis muscle avulsion is not associated with anal incontinence. Aust NZ J Obstet Gynaecol, 2011. 51(2): p. 130–135.

  88. Mathew S, et al. Levator ani muscle injury and risk for urinary and fecal incontinence in parous women from a normal population, a cross-sectional study. Neurourol Urodyn. 2019;38(8):2296–302.

    Article  PubMed  Google Scholar 

  89. Melendez J, et al. Is levator trauma an independent risk factor for anal incontinence? Dis Colon Rectum. 2020;22(3):298–302.

    Google Scholar 

  90. Atan I, et al. It is the first birth that does the damage: a cross-sectional study 20 years after delivery. Int Urogynecol J. 2018;29:1637–43.

    Article  Google Scholar 

  91. Dietz , H., et al., Levator avulsion and vaginal parity: do subsequent vaginal births matter? Int Urogynecol J, 2020. online first.

  92. Oversand S, et al. Levator ani defects and the severity of symptoms in women with anterior compartment pelvic organ prolapse. Int Urogynecol J. 2018;29(1):63–9.

    Article  PubMed  Google Scholar 

  93. Dietz H. Does delayed childbearing increase the risk of levator injury in labour? Aust NZ J Obstet Gynaecol. 2007;47:491–5.

    Article  Google Scholar 

  94. Rahmanou P, et al. The association between maternal age at first delivery and risk of obstetric trauma. Am J Obstet Gynecol. 2016;215:451.e1–7.

    Article  Google Scholar 

  95. Shek K, Chantarasorn V, Dietz H. Can levator avulsion be predicted antenatally? Am J Obstet Gynecol. 2010;202(6):586.e1–6.

    Article  Google Scholar 

  96. Valsky, D., et al., Fetal head circumference and length of second stage of labor are risk factors for levator ani muscle injury, diagnosed by 3-dimensional transperineal ultrasound in primiparous women . Am J Obstet Gynecol, 2009. 201: p. 91.e1–7.

  97. Speksnijder L, et al. Association of levator injury and urogynecological complaints in women after their first vaginal birth with and without mediolateral episiotomy. Am J Obstet Gynecol. 2019;220:93.e1–9.

    Article  Google Scholar 

  98. Caudwell-Hall J, et al. Intrapartum predictors of maternal levator ani injury. Acta Obstet Gynecol Scand. 2017;96:426–31.

    Article  PubMed  Google Scholar 

  99. Friedman T, Eslick G, Dietz H. Delivery mode and the risk of levator muscle avulsion: a meta-analysis. Int Urogynecol J. 2019.

  100. Caudwell-Hall J, Weishaupt J, Dietz H. Contributing factors in forceps associated pelvic floor trauma. Int Urogynecol J. 2019.

  101. Lammers K, et al. Correlating signs and symptoms with pubovisceral muscle avulsions on magnetic resonance imaging. Am J Obstet Gynecol. 2013;208(2):148.e1–7.

    Article  Google Scholar 

  102. Cassadó J, et al. Does episiotomy protect against injury of the levator ani muscle in normal vaginal delivery? Neurourol Urodyn. 2014;33(8):1212–6.

    Article  PubMed  Google Scholar 

  103. Kruger J, et al. Characterizing levator-ani muscle stiffness pre- and post-childbirth in European and Polynesian women in New Zealand: a pilot study. Acta Obstet Gynecol Scand. 96:1234–42.

  104. Blasi I, et al. Intrapartum translabial three-dimensional ultrasound visualization of levator trauma. Ultrasound Obstet Gynecol. 2011;37(1):88–92.

    Article  CAS  PubMed  Google Scholar 

  105. Song Q, et al. Long-term effects of simulated childbirth injury on function and innervation of the urethra. Neurourol Urodyn. 2015;34:381–6.

    Article  PubMed  Google Scholar 

  106. Abdool Z, Sultan A, Thakar R. Ultrasound imaging of the anal sphincter complex: a review. Br J Radiol. 2012;85:865–75.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  107. Dietz H, Pardey J, Murray H. Maternal birth trauma should be a key performance Indicator of maternity services. Int Urogynecol J. 2015;26:29–32.

    Article  CAS  PubMed  Google Scholar 

  108. Murphy D, Strachan B, Bahl R. Assisted vaginal birth. Br J Obstet Gynaecol. 2020.

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Correspondence to Hans Peter Dietz.

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HP Dietz has received unrestricted educational grants, travel assistance and lecture fees from GE Medical and Mindray. HP Dietz is the Director of the IUGA Online Course 'Pelvic Floor Imaging' accessible at: https://www.iuga.org/education/pfic/pfic-overview.

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Dietz, H.P. Ultrasound imaging of maternal birth trauma. Int Urogynecol J 32, 1953–1962 (2021). https://doi.org/10.1007/s00192-020-04669-8

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