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American Academy of Pediatrics
Article

In Utero Antidepressants and Neurodevelopmental Outcomes in Kindergarteners

Deepa Singal, Dan Chateau, Shannon Struck, Janelle Boram Lee, Matthew Dahl, Shelly Derksen, Laurence Y. Katz, Chelsea Ruth, Ana Hanlon-Dearman and Marni Brownell
Pediatrics May 2020, 145 (5) e20191157; DOI: https://doi.org/10.1542/peds.2019-1157
Deepa Singal
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Dan Chateau
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Shannon Struck
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Janelle Boram Lee
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Matthew Dahl
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Shelly Derksen
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Laurence Y. Katz
dDepartment of Psychiatry, Child and Adolescent Psychiatry Health Sciences Centre, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
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Chelsea Ruth
aSection of Neonatology, Department of Pediatrics and Child Health,
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Ana Hanlon-Dearman
bSection of Developmental Pediatrics, Department of Pediatrics and Child Health Policy, and
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Marni Brownell
cDepartment of Community Health Sciences, Manitoba Centre for Health Policy, and
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Abstract

Video Abstract

OBJECTIVES: To determine if in utero selective serotonin reuptake inhibitor (SSRI) or selective serotonin norepinephrine inhibitor (SNRI) exposure is associated with developmental vulnerability in kindergarten among children whose mothers were diagnosed with prenatal mood or anxiety disorder.

METHODS: Linkable administrative data were used to create a population-based cohort of 266 479 mother-child dyads of children born in Manitoba, Canada, between 1996 and 2014, with follow-up through 2015. The sample was restricted to mothers who had a mood or anxiety disorder diagnosis between 90 days before conception (N = 13 818). Exposed women had ≥2 SSRI or SNRI dispensations during pregnancy (n = 2055); unexposed mothers did not have a dispensation of an SSRI or SNRI during pregnancy (n = 10 017). The Early Development Instrument (EDI) was used to assess developmental health in kindergarten children. The EDI is a 104-component kindergarten teacher-administered questionnaire, encompassing 5 developmental domains.

RESULTS: Of the 3048 children included in the study who met inclusion criteria and had an EDI, 21.43% of children in the exposed group were assessed as vulnerable on 2 or more domains versus 16.16% of children in the unexposed group (adjusted odds ratio = 1.43; 95% confidence interval 1.08–1.90). Children in the exposed group also had a significant risk of being vulnerable in language and/or cognition (adjusted odds ratio = 1.40; 95% confidence interval 1.03–1.90).

CONCLUSIONS: Exposure to SSRIs or SNRIs during pregnancy was associated with an increased risk of developmental vulnerability and an increased risk of deficits in language and/or cognition. Replication of results is necessary before clinical implications can be reached.

  • Abbreviations:
    EDI —
    Early Development Instrument
    HDPS —
    high-dimensional propensity score
    ICD-9-CM —
    International Classification of Diseases, Ninth Revision, Clinical Modification
    ICD-10-CA —
    International Classification of Diseases, 10th Revision, with Canadian Enhancement
    IPTW —
    inverse probability of treatment weights
    MCHP —
    Manitoba Centre for Health Policy
    SNRI —
    selective serotonin norepinephrine inhibitor
    SSRI —
    selective serotonin reuptake inhibitor
  • What’s Known on This Subject:

    Children exposed in utero to antidepressants have higher rates of adverse outcomes in infancy. However, there are limited studies that investigate the long-term neurodevelopmental effects of in utero exposure to these medications on early childhood development.

    What This Study Adds:

    Children of mothers diagnosed with a mood or anxiety disorder who took serotonergic antidepressants during pregnancy had an increased risk of developmental vulnerability and deficits in language and cognition in kindergarten.

    Up to 12% of women are diagnosed with perinatal depression.1 Selective serotonin reuptake inhibitors (SSRIs) are one of the most commonly prescribed antidepressant medications, including in pregnancy2;10% of women are prescribed SSRIs during pregnancy.3,4 In numerous studies, authors have investigated adverse infant outcomes associated with in utero antidepressant exposure, including neonatal adaptation syndrome,5–7 pulmonary hypertension,8–10 cardiac malformations,5,11 low birth weight,12–14 small for gestational age,12,13 and motor and cognitive outcomes.15–18 These studies yielded conflicting results and revealed small absolute risks when comparing children exposed in utero to untreated maternal depression.8,19

    Fewer studies have been used to investigate long-term neurodevelopmental effects of in utero exposure to antidepressants. Recent studies yielded conflicting results regarding increased risk of autism spectrum disorder20–23 and attention-deficit/hyperactivity disorder24–26 in children exposed to in utero antidepressants. Several studies indicated5,13,27 difficulties in psychomotor function and motor quality among infants exposed to antidepressant medications in utero. A recent population-based analysis from Finland28 revealed an increased risk of speech and/or language disorders in children of mothers diagnosed with psychiatric disorders who used SSRIs during pregnancy. These investigations indicate in utero SSRI exposure may have implications on fetal brain development and sustained cognitive impairment into childhood.

    Educational outcomes are important indicators of child neurodevelopment; however, data investigating these additional indicators of development are scarce. Two studies have been used to examine the association between in utero antidepressant exposure and elementary school outcomes in offspring.29,30 Authors of a population-based study in Denmark29 found an association between in utero exposure to SSRIs and delayed elementary school entry in children. A study in a US hospital setting was used to examine preschool outcomes of language skills and cognitive functions, and the authors found a significant relationship with prenatal SSRI exposure.30 Findings should be replicated in other settings, using validated measures of educational achievement to reach conclusions about the effect of in utero serotonergic antidepressant exposure and early childhood development.

    In this study, we use a North American population-based cohort to investigate the impact of in utero SSRI and serotonin norepinephrine reuptake inhibitors (SNRI) exposure on development as reflected in children’s ability to meet age-appropriate developmental expectations in kindergarten, using the Early Development Instrument (EDI). We address limitations in previous studies by using a generalizable, population-based sample, conducting long-term follow-up, using a globally accepted measure of child development and a high-dimensional propensity score (HDPS) algorithm to control for confounding. To address confounding by indication, we included a comparison group of offspring of women who were diagnosed with a mood or anxiety disorder during pregnancy but did not take SSRIs or SNRIs.

    Methods

    Setting and Data

    We used deidentified administrative data from Manitoba, Canada (population of ∼1.3 million). Data were accessed from the Manitoba Population Research Data Repository, housed at the Manitoba Centre for Health Policy (MCHP). The repository includes 99% of Manitobans and contains individual-level data on all contacts with the health care system.31 Data are linkable across domains (ie, health, social, education) and within families, allowing for robust epidemiological research. Linkages are completed by using scrambled deidentified personal health information numbers. These data have been widely used for health services research.32–40

    Medication use was obtained by using data from the Drug Program Information Network, which contains information on all prescription medications dispensed in Manitoba. Health data were accessed by using hospital discharge abstracts and physician claims for services provided to give counts and diagnostic information for outpatient visits. Hospital discharge abstracts are coded by using International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) (before April 1, 2004)41 and International Classification of Diseases, 10th Revision, with Canadian Enhancement (ICD-10-CA) (after April 1, 2004),42 and physician claims are coded by using the ICD-9-CM.

    Kindergarten assessment data were obtained from the provincial department of education.

    Study Cohort

    This study included all mother-child dyads for mothers with a live hospital birth between April 1, 1996, and March 31, 2014 (with follow-up until 2015), in Manitoba. Dyads were excluded for the following factors: there was no continuous health coverage of mothers from 90 days before conception to birth; there was no linkage between the mother and child, or the child was linked to >1 mother; the infant was stillborn or a multiple; the infant did not have a recorded gestational age; the mother did not have at least 1 diagnosis of a mood or anxiety disorder from 90 days before conception, had only 1 filled SSRI or SNRI prescription, had a prescription for an antidepressant other than SSRIs or SNRIs during pregnancy, or was exposed to antipsychotics, benzodiazepines, or opioids during pregnancy. From eligible mother-child dyads, those with children with no recorded EDI were removed (Fig 1: cohort formation). The final cohort was subdivided for each EDI outcome on the basis of the availability of complete EDI records.

    FIGURE 1
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    FIGURE 1

    Study cohort flow diagram. PHIN, personal health information number. a Table 3 contains individual outcome cohort sample sizes.

    Exposures

    Prenatal Mood or Anxiety Disorder

    Mothers were considered to have a prenatal mood or anxiety disorder if in the 90 days before conception they had one of the following: 2 or more physician visits with a diagnosis for anxiety disorders; 1 or more physician visits with a diagnosis for depressive disorder, affective psychoses, or adjustment reaction; 1 or more hospitalizations with a diagnosis for anxiety disorders, anxiety states, phobic disorders, or obsessive-compulsive disorders; or 1 or more hospitalizations with a diagnosis for depressive disorder, affective psychoses, neurotic depression, or adjustment reaction. Specific ICD-9-CM and ICD-10-CA codes are listed in Supplemental Table 4.

    Prenatal SSRI or SNRI

    Dyads that include a mother with at least 2 prescriptions filled for SSRIs or SNRIs from the time of conception to birth were included in the prenatal SSRI or SNRI exposed group. The unexposed group included dyads with mothers who had no recorded prescriptions for antidepressants during pregnancy.

    Outcome Measure

    We used the EDI to measure the impact of in utero antidepressant medications on developmental outcomes among children whose mother had a diagnosis of mood or anxiety disorder. The EDI is a 104-component kindergarten teacher-completed questionnaire that measures developmental health in 5 domains: physical health and well-being, language and cognitive development, social competence, emotional maturity, and communication skills and general knowledge.43 Children are considered developmentally vulnerable in a domain if they score in the bottom 10th percentile on the basis of national norms. Children with completed assessments accessible in the repository were included in the outcome analysis. The EDI is administered every 2 years to all students enrolled in the public school system in the second half of kindergarten (mean age of 5.7 years). The first province-wide administration of the EDI was in the 2005–2006 school year. The validity and reliability of the EDI has been reported widely, and it is used globally as a population-level indicator of developmental health.44–48

    Statistical Analysis

    Women diagnosed with a mood or anxiety disorder who continue their medications during pregnancy may be different in health characteristics and disease severity than women who discontinue antidepressants during pregnancy. These differences may contribute to variation in outcomes seen in children versus the effect of the medications in utero. To make the 2 study groups more comparable, we used HDPS adjustments to balance differences between groups. In studies, authors have found that adjustments using HDPS have resulted in effect estimates closer to randomized control trials when compared to standard covariate adjustments.49,50 For each of the educational outcomes, we ran HDPS adjustments using a multistep algorithm that identifies potential confounders from the database by selecting variables correlated to both the exposure and the outcome, prioritizing these covariates by prevalence and potential for bias, and integrating them into a logistic model from which propensity scores are derived.

    Covariates were drawn from data 365 days before conception, which included (1) medical service tariff codes, (2) physician diagnostic codes, (3) hospital procedure codes, (4) hospital diagnostic codes, and (5) prescription medication claims. Using information from these data dimensions improves control for confounding by using numerous proxy covariates that describe the health status of women in this study, including comorbid conditions, concurrent medication use, and disease severity.

    Inverse probability of treatment weights (IPTW) was applied to the data to adjust for the top 500 covariates identified in the HDPS estimation risk estimates. Using IPTW will provide a true average treatment effect of the use of SSRIs or SNRIs among depressed women. Using another method, such as matching, would produce an estimate of the treatment effect among the treated, which does not address the potential benefit or harm of expanded use of SSRIs or SNRIs in this population. The cohort was trimmed to include only those dyads with a propensity score >0.2 and less the propensity score of the 80th percentile among the treated group, to establish comparability between exposed and unexposed groups.51 Specifically, to ensure that women from the low-propensity strata, which are primarily composed of patients for whom most physicians would regard treatment with antidepressants as inappropriate, are removed from the analyses. We calculated standardized differences for the covariates used in the HDPS model to investigate if the adjustment reduced the difference between groups. In Fig 2, we illustrate the standardized differences before and after inverse probability of treatment weighting between women unexposed and exposed to antidepressants during pregnancy and the example outcome of EDI not ready in 2 more domains. Standardized differences <0.10 were not considered clinically meaningful.

    FIGURE 2
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    FIGURE 2

    Standardized difference between women unexposed and exposed to antidepressants during pregnancy for EDI not ready in 2 or more domains. SEFI, Socioeconomic Factor Index.

    Logistic regression analyses were used for all outcome models. Prematurity, small for gestational age, and inadequate prenatal care were included as covariates in the outcome model.

    Results

    Our cohort included 266 479 women with a live birth between 1996 and 2014. Among these women, mothers with only 1 SSRI or SNRI prescription during pregnancy, those who were treated with an antidepressant other than an SSRI or SNRI (n = 1247), and those who did not have 1 full year of health coverage before conception date (n = 499) were excluded. Among our study cohort, 12 072 women had a diagnosis of a mood or anxiety disorder before conception.

    The exposed group, mothers who had 2 or more SSRI or SNRI prescription dispensations during pregnancy, included 2055 women; the unexposed group, those who did not have an SSRI or SNRI prescription during pregnancy included 10 017 women (see Fig 1). Among this cohort, 3050 children had an EDI record.

    Mothers and children in the exposure groups had different levels of baseline characteristics (see Table 1). By using HDPS, each characteristic was weighted for both groups, and standardized differences were adjusted to <0.10 with a few exceptions (see Table 2, Supplemental Tables 5 through 10). The variables included in the HDPS differed for each model because they were selected on the basis of correlations to the exposure and each different educational outcome. Therefore, mothers received different weights for each outcome, resulting in a slightly different sample size for each of the outcomes presented. After trimming of each sample, exposed and unexposed dyads did not differ significantly on observed health and social covariates (see Supplemental Tables 5 through 10 for weighted and unweighted standardized differences of the top covariates in each outcome model).

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    TABLE 1

    Maternal, Child, and Medication Use Characteristics of Eligible Mothers With EDI Records of Children

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    TABLE 2

    Characteristics of and Standardized Differences Between Women Unexposed and Exposed to Antidepressants During Pregnancy for EDI Not Ready in 2 or More Domains

    Compared with children in the unexposed group, children whose mothers were dispensed at least 2 prescriptions for an SSRI or SNRI during pregnancy were at an increased risk for having developmental vulnerability in 2 or more domains measured by EDI (adjusted odds ratio = 1.43; 95% confidence interval 1.08–1.90; Table 3). Exposure to at least 2 SSRIs or SNRIs in utero was also significantly associated with being vulnerable in the domain of language and cognitive development (adjusted odds ratio = 1.40; 95% confidence interval 1.03–1.91; Table 3). Prenatal use of 2 or more SSRIs or SNRIs were not significantly associated with developmental vulnerability in children in the following domains: physical well-being, communication and/or general knowledge, social competence, and emotional maturity, as well as 1 or more domains (Table 3).

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    TABLE 3

    EDI Not-Ready Results: Exposed Versus Unexposed

    Discussion

    We found 21.43% of children exposed in utero to SSRIs or SNRIs were at increased risk of being developmentally vulnerable in 2 or more domains (versus 16.16% of unexposed children), which is an absolute risk difference of 5.27%. This means for every 19 women who took an antidepressant during pregnancy in our study, 1 more child was at risk for vulnerability in 2 or more domains on the EDI. Data collection across Canada reveals that 25% or more kindergarten children are vulnerable in at least 1 area of development.52 The percentage of children who were vulnerable in 2 or more domains is a more sensitive measure of developmental vulnerability. We also found that ∼13% of children in the exposed group were vulnerable in the language and cognitive domain compared with 12% of unexposed children (absolute risk difference of 0.54%). This means, on average, 185 women would have to take an SSRI or SNRI during pregnancy for 1 more child to be vulnerable in language and cognition.

    SSRI exposure on associations found in this study has biological plausibility because animal studies support that atypical serotonergic signaling resulting from prenatal SSRI exposure may alter fetal brain development.19,53,54 Moreover, authors of a recent human study using MRI found prenatal SSRI exposure has a significant association with fetal brain development.55

    Our findings are consistent with Johnson et al30 (2016) who conducted an observational longitudinal study in a US clinic setting and found a significant relationship between language skills and cognitive functions with prenatal SSRI exposure. However, our findings are inconsistent with results from adjusted analyses from Kragholm et al29 (2018) which found no association between in utero exposure to SSRIs and delayed elementary school entry and special school needs in children.

    Our results add to an emerging body of literature that reveals an association of negative academic outcomes in early childhood and language difficulties for children whose mothers have a clinical indication of a mood or anxiety disorder during pregnancy who have been treated with antidepressants. Additional research using population-based samples and robust methodology are required to triangulate findings before definitive clinical recommendations can be made. Results of our study are most generalizable to women with a diagnosis of a mood or anxiety disorder before pregnancy because this is the population in which the clinical decision to continue medications during pregnancy is most relevant. Women must weigh the risks of untreated depression with their physicians before making a decision to stop taking antidepressants during pregnancy.

    Our findings point to the need for early intervention and supports for children of mothers who have depression and/or anxiety disorders during pregnancy. Developmental vulnerability as measured by the EDI is considered an important measure that is associated with later positive educational outcomes,56,57 and EDI results are a strong predictor of future academic success.58 Brinkman et al59 report that children with scores in the bottom 10th percentile of the EDI later test just as poorly on national standardized tests of literacy and numeracy in grades 3, 5, and 7, with the strongest correlations found within the language and cognition domain. Our findings point to the increased vulnerability in the area of language and cognition among children exposed to in utero maternal depression, highlighting the risk these children have for negative educational outcomes in the future.

    This study has several strengths. First, the use of the Manitoba Population Research Data Repository provides a population-based cohort, minimizes attrition and detection bias, and allows inclusion of numerous covariates over many years. These longitudinal data are ideal for investigating outcomes during early childhood. Moreover, the use of standardized Canadian education data and a recognized global measure of educational attainment strengthens the generalizability of results. We used sophisticated design and analysis to address a frequent critique of investigations examining outcomes of children exposed to in utero antidepressant medication, namely, the ability to determine if results are confounded by the underlying maternal depression that resulted in the exposure to medication. Our use of a restricted study population of all women diagnosed with a mood or anxiety disorder decreases this confounding by indication and takes account of the difference in postnatal interactions of a mother who may be depressed versus a mother who is not depressed. The use of HDPS adjustments to balance baseline covariates adjusts for disease severity and important maternal comorbidity. The HDPS algorithm accounts for all physician and hospital visits (number of visits to physician or hospital, including number of previous suicide attempts), diagnoses (all diagnoses of mood or anxiety disorders, all diagnosis of other mental disorders, or comorbid physical disorders), and procedures, as well as all prescription medications (all medications with and without psychiatric indication) dispensed to our study population. This powerful algorithm adjusts for all measured confounders present in these data; adjustments using HDPS result in effect estimates closer to randomized control trial findings when compared to standard covariate adjustments. Moreover, HDPS has also been shown to adjust for hidden confounders,60 supporting that this method can adjust for some unmeasured confounders as well, strengthening the robustness of our analyses.

    Despite the many strengths, there are important limitations. First, there is the potential for misclassification of exposure if prescriptions were filled but not used, creating a bias toward the null. To decrease this error, we included women who had 2 or more dispensations throughout their pregnancy. Furthermore, despite using sophisticated methods to control for confounding, we cannot account for all unmeasured or residual confounding, including disease severity. It is also important to note that although the EDI is administered across the entire public school system in Manitoba, children enrolled in some schools operated by indigenous communities and private schools are not included. Furthermore, the EDI is a community-level indicator and may lack the specific diagnostic ability to identify individual neurocognitive deficits in individual children but can identify population-level trends. Also, there may be bias in the assessment of educational outcomes by teachers; however, it is impossible to discern if bias would systematically affect our exposed versus unexposed group because teachers were not aware of exposure status. Hence, any error resulting from this bias would be random. Finally, given the multiple tests performed, chance finding cannot be ruled out. Replication of these findings in other large population-based cohorts should be conducted to help guide clinical decision-making. Studies looking at the variation in results of different types of antidepressants, dose-response effect, and gestational timing of medication on educational outcomes are warranted.

    Conclusions

    Children of mothers diagnosed with a mood or anxiety disorder who used SSRIs or SNRIs during pregnancy were at risk for developmental vulnerability and for language and cognitive difficulties. Early interventions should be provided to children exposed to maternal depression during pregnancy in kindergarten to help ameliorate later educational challenges.

    Acknowledgments

    We are indebted to Healthy Child Manitoba, Manitoba Education and Training, and Manitoba Families for the provision of data. We acknowledge the MCHP for use of data contained in the Manitoba Population Research Data Repository under project 2015/16-35 registered with the Manitoba Health Information Privacy Committee. The results and conclusions are those of the authors, and no official endorsement by the MCHP, Manitoba Health, Seniors and Active Living, or other data providers is intended or should be inferred.

    Footnotes

      • Accepted February 11, 2020.
    • Address correspondence to Deepa Singal, PhD, Manitoba Centre for Health Policy, Community Heath Sciencs, Max Rady College of Medicine, Rady Faculty of Health Sciences, Room 408-727 McDermot Ave. University of Manitoba, Winnipeg, MB, Canada R3E 3P5. E-mail: deepakapoorsingal{at}gmail.com
    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: Supported by an operating grant from the Canadian Institutes of Health Research (142356).

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

    • COMPANION PAPER: A companion to this article can be found online at www.pediatrics.org/cgi/doi/10.1542/peds.2019-3578.

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    In Utero Antidepressants and Neurodevelopmental Outcomes in Kindergarteners
    Deepa Singal, Dan Chateau, Shannon Struck, Janelle Boram Lee, Matthew Dahl, Shelly Derksen, Laurence Y. Katz, Chelsea Ruth, Ana Hanlon-Dearman, Marni Brownell
    Pediatrics May 2020, 145 (5) e20191157; DOI: 10.1542/peds.2019-1157

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    In Utero Antidepressants and Neurodevelopmental Outcomes in Kindergarteners
    Deepa Singal, Dan Chateau, Shannon Struck, Janelle Boram Lee, Matthew Dahl, Shelly Derksen, Laurence Y. Katz, Chelsea Ruth, Ana Hanlon-Dearman, Marni Brownell
    Pediatrics May 2020, 145 (5) e20191157; DOI: 10.1542/peds.2019-1157
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