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American Academy of Pediatrics
Article

Drinking or Smoking While Breastfeeding and Later Cognition in Children

Louisa Gibson and Melanie Porter
Pediatrics August 2018, 142 (2) e20174266; DOI: https://doi.org/10.1542/peds.2017-4266
Louisa Gibson
Department of Psychology, Faculty of Human Sciences, Macquarie University, Sydney, Australia
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Melanie Porter
Department of Psychology, Faculty of Human Sciences, Macquarie University, Sydney, Australia
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Abstract

BACKGROUND AND OBJECTIVES: Although prenatal alcohol and nicotine exposure are associated with reduced cognition in children, associations between consumption of alcohol during lactation and cognition have not been examined. We aimed to examine whether drinking or smoking while breastfeeding lowers children’s cognitive scores. We hypothesized that increased drinking or smoking would be associated with dose-dependent cognitive reductions.

METHODS: Data were sourced from Growing Up in Australia: The Longitudinal Study of Australian Children. Participants were 5107 Australian infants recruited in 2004 and assessed every 2 years. Multivariable linear regression analyses assessed relationships between drinking and smoking habits of breastfeeding mothers and children’s Matrix Reasoning, Peabody Picture Vocabulary Test–Third Edition and Who Am I? scores at later waves.

RESULTS: Increased or riskier wave 1 maternal alcohol consumption was associated with reductions in Matrix Reasoning scores at age 6 to 7 years in children who had been breastfed (B = −0.11; SE = 0.03; 95% confidence interval: −0.18 to −0.04; P = .01). This relationship was not evident in infants who had never breastfed (B = −0.02; SE = 0.10; 95% confidence interval = −0.20 to 0.17; P = .87). Smoking during lactation was not associated with any outcome variable.

CONCLUSIONS: Exposing infants to alcohol through breastmilk may cause dose-dependent reductions in their cognitive abilities. This reduction was observed at age 6 to 7 years but was not sustained at age 10 to 11 years. Although the relationship is small, it may be clinically significant when mothers consume alcohol regularly or binge drink. Further analyses will assess relationships between alcohol consumption or tobacco smoking during lactation and academic, developmental, physical, and behavioral outcomes in children.

  • Abbreviations:
    AUDIT-C —
    Alcohol Use Disorders Identification Test Alcohol Consumption Questions
    CI —
    confidence interval
    LSAC —
    Growing Up in Australia, The Longitudinal Study of Australian Children
    MI —
    multiple imputation
    MR —
    Matrix Reasoning
    PPVT-III —
    Peabody Picture Vocabulary Test–Third Edition
    VIF —
    variance inflation factor
    WAI —
    Who Am I? test
  • What’s Known on This Subject:

    Although alcohol is a known teratogen, studies of maternal alcohol use during breastfeeding and infants’ basic developmental scores have produced mixed results. No previous study has assessed the impact of maternal drinking or smoking on cognitive outcomes in the child.

    What This Study Adds:

    This is the first study to directly examine cognitive outcomes in relation to lactational alcohol and nicotine exposure. Increased or riskier maternal alcohol consumption while breastfeeding was associated with reduced abstract reasoning ability in the child at age 6 to 7 years.

    Although teratogenic effects of alcohol are well documented,1–4 cognitive risks of alcohol and breastfeeding are unknown.5 Likewise, although tobacco smoking during pregnancy is associated with reductions in childhood cognition,6 cognitive effects from smoking tobacco during lactation have not been researched. Because alcohol7 and nicotine8 are available in breastmilk after maternal intake, understanding whether smoking tobacco or drinking alcohol during lactation impacts children’s cognitive abilities is important.

    Although the World Health Organization recommends avoiding alcohol and drugs while breastfeeding,9 12% to 83%5,10–16 of breastfeeding women report consuming alcohol and 7% to 16%11,17 report smoking tobacco. These may be underestimates because people often underreport alcohol drinking habits.18 Older maternal age, increased education, and longer breastfeeding duration are associated with increased alcohol consumption during lactation.11 Conversely, younger maternal age, lower education, and decreased income are associated with increased tobacco smoking.19

    Breastfeeding women report drinking alcohol because of the lack of harmful evidence20 and a mistaken21 belief that alcohol is a galactagogue.20 Alcohol passes quickly through to breastmilk at similar concentrations to maternal blood alcohol concentration22 and reduces milk production.21 Although drinking alcohol immediately after feeding minimizes ethanol exposure,23 not all women use this technique,16,20 and unpredictable infant feeding can mar such attempts.20 Expressing and discarding “contaminated” breastmilk does not reduce ethanol concentration because this is related to maternal blood alcohol concentration.7

    Nicotine also passes quickly through to breastmilk, in which concentrations may be higher than maternal serum concentrations.8 Nicotine is associated with reduced milk production and changes in breastmilk composition and taste.24 Breastfeeding women report that despite a belief that maternal tobacco smoking is harmful to infants, difficulties curbing addictive behaviors interfere with its cessation.25

    Studies in which alcohol consumption or tobacco smoking during lactation are assessed are limited, and conductors of rat studies generally expose dams to larger alcohol quantities than consumed by human mothers. Despite this, available research suggests that alcohol exposure through breastmilk may have negative cognitive consequences for offspring. Research of dams intoxicated while pregnant and lactating found reduced learning in pups.26 This may be because of prenatal exposure alone, however, because Gray et al27 found no decline when alcohol was only given during lactation. Likewise, dam offspring who consumed alcohol while pregnant and nursing had reduced hippocampal neurons,28 cerebellar neurons,29 and increased cerebral cortex cell apoptosis and necrosis.30 Similar neuronal loss and decreased myelination in pup cerebellums was also found after only lactational exposure.31

    Human research has largely been focused on disrupted infant sleeping and feeding patterns.5,32 The authors of a case study from 1978,33 however, described an infant who developed a pseudo-Cushing syndrome after high maternal alcohol consumption during lactation but not pregnancy. Symptoms abated after alcohol cessation. Whereas Little et al34,35 found reduced psychomotor scores at 1 year in infants whose mothers drank alcohol while breastfeeding, the authors of more recent studies found no reduction in developmental scores.16

    Rat studies of nicotine intake during lactation have revealed reversible hypothyroidism in offspring.36,37 Although hypothyroidism is associated with cognitive deficits in humans,38 Gaworski et al39 found that pups exposed to nicotine during pregnancy and lactation had intact learning and memory.39 In a study of dams exposed to nicotine during pregnancy and lactation, offspring had delayed muscarinic receptor development.40 Because decreased acetylcholine transmission is associated with cognitive decline,41 this could potentially impact cognitive development.

    Human studies in which relationships between tobacco smoking during lactation and childhood developmental outcomes are assessed are scant.42,43 Women who smoke may have infants of lower birth weight44 and wean infants earlier.45 Because low birth weight46 and shorter breastfeeding duration47 are associated with decreased cognition, these factors alone could reduce infant cognition. Laurberg et al48 found that smoking tobacco while lactating caused dose-dependent reductions in milk iodine content and increased children’s risk of iodine deficiency. Although iodine deficiency could theoretically result in cognitive impairment,49 this was not examined.48

    In the context of available research, our aim in the current study was to assess whether drinking alcohol or smoking tobacco during lactation adversely impacts cognitive outcomes in children. It was hypothesized that alcohol and nicotine use would result in lower cognitive scores in a dose-dependent manner independent of pregnancy use.

    Methods

    Ethics

    Ethics approval was obtained from Macquarie University Human Research Ethics Committee.

    Study Design and Data Source

    Data were sourced from Growing Up in Australia: The Longitudinal Study of Australian Children (LSAC). Detailed information regarding LSAC can be found on the LSAC Web site.50 Briefly, LSAC is a longitudinal study of Australian children and their families, conducted by the Australian Government Department of Social Services, the Australian Institute of Family Studies, and the Australian Bureau of Statistics. The researchers aim to examine impacts of social and cultural variables on a range of physical and psychological health and developmental outcomes.51

    Study Cohort

    Two cohorts (B and K) were recruited into LSAC at wave 1 in 2004. Cohort K was not included in current analyses because the children were 4 to 5 years old at recruitment. Cohort B comprised 5107 infants and caregivers who were managed over time every 2 years. Demographic, lifestyle, cognitive, academic, and developmental variables were collected at each of the 6 waves available for data analyses52,53; further recruitment details are available in LSAC Technical Paper No. 1.54

    Breastfeeding

    Caregivers were asked whether infants were being breastfed at wave 1 and whether they had ever been breastfed.55 This allowed stratification into wave 1 breastfeeding infants and infants who had been breastfed at any time.

    Predictor Variables

    Mothers were asked a modified version of the Alcohol Use Disorders Identification Test Alcohol Consumption Questions (AUDIT-C)56,57 at wave 1 (Table 1). Respondents who answered “never” to question 1 were assigned a score of 0 for question 2. Scores were summed to create a total score (range: 1–19). Higher scores indicated increased or riskier alcohol consumption. Pregnancy alcohol was recorded retrospectively (Table 1). The average number of days pregnant mothers drank alcohol per week was calculated by averaging trimester results. Mothers were asked how many cigarettes they smoked on average per day at wave 1 and how many cigarettes they smoked on average per day during pregnancy.55

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    TABLE 1

    Frequencies for Each of the Responses and Missing Data for Categorical Predictor, Control, and Outcome Variables Before Data Imputation (N = 5107)

    Outcome Variables

    Outcome variables were as follows:

    • Transformed scores from an adapted Peabody Picture Vocabulary Test–Third Edition (PPVT-III)58,59 (waves 3, 4 and 5). Higher scores indicated increased vocabulary.

    • Raw scores from the Matrix Reasoning (MR) subtest of the Wechsler Intelligence Scale for Children-Fourth Edition60 (waves 4, 5 and 6). Higher scores indicated increased nonverbal reasoning.

    • Raw scores from the Who Am I? test (WAI),59,61,62 with 1 change to item 1163 (wave 3). Higher scores indicated increases in cognitive processes underlying early literacy and numeracy.

    Control Variables

    Infant sex was controlled for because of postulated sex differences in cognitive abilities.64 Infant and maternal age were included because maternal age is associated with alcohol and cigarette use during lactation,11,19 and cognition varies with age.65 Because women who smoke tend to have lower birth weight infants44 and lower birth weight is associated with poorer cognition,46 birth weight was also included as a control variable. Breastfeeding duration was controlled for because earlier weaning is associated with lowered cognition47 as well as maternal tobacco smoking.45

    Combined household income and maternal education were included because both are associated with tobacco smoking and alcohol consumption during lactation11,19 as well as cognitive outcomes.66 Learning difficulties (delay relative to peers in the context of a medical condition) and brain injuries (concussion and/or internal head injury requiring medical attention) were included as control variables because both can alter cognitive profiles.67,68 The primary language spoken at home was only included for the adapted PPVT-III and WAI analyses because both are language reliant.

    Statistical Analyses

    Data were analyzed by using IBM SPSS version 24 (IBM SPSS Statistics, IBM Corporation). Missing data from all included variables were imputed by using multiple imputation (MI). To reduce estimate bias, arithmetically derived variables were calculated after MI of individual items.69 Thirty imputations were used because the highest proportion of missing data for any variable was 30% (Supplemental Information). When missing data are ˂50%, matching the imputation number to missing data percentage increases efficiency and replicability of data.70 Imputations were constrained to variable ranges where applicable and were not rounded to integers to reduce estimate bias.71 Skewed independent variables were not transformed before MI because this can produce poorer estimates.72

    Multivariable linear regression analyses were performed including each of the predictor and control variables. Multicollinearity was assessed by using the variance inflation factor (VIF). A VIF ˂10 was considered acceptable.73 Analyses were conducted separately for each outcome variable at each wave. Only data from biological mothers were included. Infants still being breastfed at wave 1 and infants who had been breastfed at any time were analyzed separately. The Benjamini and Hochberg74 procedure was used to correct for type I error (α = .05). This procedure is superior to the Bonferroni correction in preserving power.74

    Results

    Descriptive Statistics

    Full descriptive statistics of all variables before MI are shown in Tables 1 and 2.

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    TABLE 2

    Means, SDs, Ranges, and Missing Data for Quantitative Predictor, Control, and Outcome Variables Before Data Imputation (N = 5107)

    Power Analyses

    Sixteen female caregivers who were not biological mothers were excluded after MI. This left 2009 breastfed infants and 4679 infants who had been breastfed at some time. Power analyses revealed that with 2009 subjects, 99.57% (14 independent variables) and 99.49% (15 independent variables) power was achieved to detect a small effect size (Cohen's d = 0.2, α = .05). A sample size of 4679 provided ˃99% power to detect an effect size of Cohen's d = 0.2 (α = .05), with 14 or 15 independent variables.75,76

    Wave 1 Maternal Alcohol Consumption (Before MI)

    Modified AUDIT-C scores of wave 1 breastfeeding mothers (mean = 5.55; SD = 2.46; 95% confidence interval [CI]: 5.42 to 5.68) were lower than scores for mothers who were not breastfeeding (mean = 6.13; SD = 2.72; 95% CI: 6.02 to 6.24; P ˂ .001; Cohen's d = 0.22). There was no statistically significant difference in modified AUDIT-C scores between mothers who had breastfed (n = 3443; mean = 5.90; SD = 2.60; 95% CI: 5.81 to 5.99) and had never breastfed their infants (mean = 5.81; SD = 3.04; 95% CI: 5.50 to 6.13; P = .60; Cohen's d = 0.03).

    Wave 1 Maternal Tobacco Smoking (Before MI)

    Breastfeeding wave 1 mothers smoked fewer cigarettes on average per day (mean = 1.06; SD = 3.67; 95% CI: 0.77 to 1.25) than women who were not breastfeeding (mean = 2.84; SD = 5.97; 95% CI: 2.64 to 3.04; P ˂ .001; Cohen's d = 0.37). Mothers whose infants had been breastfed at some time, smoked fewer cigarettes on average per day (mean = 1.85; SD = 4.87; 95% CI: 1.69 to 2.01) than mothers whose infants had never breastfed (mean = 5.00; SD = 8.02; 95% CI: 4.43 to 5.57; P ˂ .001; Cohen's d = 0.47).

    Missing Data

    Little’s missing completely at random test revealed that data were not missing completely at random, P = ˂ .001. Previous LSAC analysis revealed that more poorly educated caregivers tended to drop out of the study,77 suggesting that missing data were related to independent variables and suitable for MI.78

    Linear Regression: MR Scores

    Full wave 5 to 6 results are available in Supplemental Table 5.

    Infants Breastfeeding at Wave 1

    Models explained 1% to 19%, 1% to 26%, and 2% to 14% of variance, respectively, across waves for each imputation. Older wave 4 child age was associated with increased wave 4 MR scores. Increased and/or riskier maternal alcohol consumption while breastfeeding was associated with decreased wave 4 MR scores. This was no longer statistically significant, however, after multiple comparison adjustment. No other statistically significant relationships were observed. Full results are shown in Table 3.

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    TABLE 3

    Infants Being Breastfed at Wave 1: Regression Coefficients, SEs, CIs, P Values, and Adjusted P Values for Each Predictor and Control Variable for Wave 4 MR Scores (n = 2009)

    Infants Who Had Been Breastfed at Any Time

    Models explained 2% to 16%, 3% to 25%, and 2% to 14% of variance, respectively, across waves for each imputation. Increased MR wave 4 scores were predicted by increased wave 4 child age. Increased or riskier maternal alcohol consumption was associated with decreased wave 4 MR scores. This relationship remained statistically significant after multiple comparison adjustments. At wave 5, only older wave 5 child age was associated with increased wave 5 MR scores. At wave 6, learning difficulties predicted lower wave 6 MR scores. Full results are shown in Table 4.

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    TABLE 4

    Infants Who Had Been Breastfed at Any Time: Regression Coefficients, SEs, CIs, P Values, and Adjusted P Values for Each Predictor and Control Variable for Wave 4 MR Scores (n = 4679)

    Infants Who Had Never Been Breastfed

    When assessing infants who had never breastfed, only modified AUDIT-C scores were included as a predictor to maximize power. With 1 independent variable, a sample size of 412 provided 80% power to detect a small effect size (Cohen's d = 0.2; α = .05).75,76 The model accounted for ˂0.001% variance, and modified AUDIT-C scores weren’t associated with wave 4 MR scores (B = −0.02; SE = 0.10; 95% CI = −0.20 to 0.17; P = .87).

    Linear Regression: WAI Scores

    Full results are available in Supplemental Table 6.

    Infants Breastfeeding at Wave 1

    The model explained 7% to 41% of variance across imputations. Older wave 3 child age was associated with increased WAI scores. Learning difficulties were also associated with decreased WAI scores. There was no associated between maternal alcohol consumption or tobacco smoking and WAI scores.

    Infants Who Had Been Breastfed at Any Time

    The model explained 9% to 41% of variance across imputations. Older wave 3 child age predicted higher WAI scores. Learning difficulties predicted lower WAI scores. No other variables were statistically significant.

    Linear Regression: Adapted PPVT-III Scores

    Full results are available in Supplemental Table 7.

    Infants Breastfeeding at Wave 1

    Models explained 4% to 17%, 2% to 15%, and 1% to 25% of variance, respectively, across waves for each imputation. Learning difficulties were associated with lower wave 3–adapted PPVT-III scores. Older wave 4 child age was associated with higher wave 4 scores. No other variables were statistically significant.

    Infants Who Had Been Breastfed at Any Time

    Models explained 3% to 13%, 2% to 14%, and 2% to 18% of variance, respectively, across waves for each imputation. Learning difficulties were associated with lower wave 3–adapted PPVT-III scores. Older wave 3 child age was associated with higher wave 4 scores. Other variables were not statistically significant.

    Discussion

    This is the first study in which associations between alcohol exposure through breastmilk and cognition in children are examined. Greater or riskier maternal alcohol intake was associated with decreased nonverbal reasoning at 6 to 7 years in a dose-dependent manner. This was independent of prenatal alcohol consumption, sex, child and maternal age, income, birth weight, breastfeeding duration, learning delay, head injury, and pregnancy and breastfeeding tobacco smoking. Although this relationship was found in wave 1 breastfeeding children, with multiple comparison adjustment it was no longer statistically significant. In children who had been breastfed at any time, however, this association remained statistically significant after adjustment.

    There was no relationship between maternal alcohol consumption and MR scores in infants who had never breastfed. This suggests that alcohol exposure through breastmilk was responsible for cognitive reductions in breastfed infants rather than psychosocial or environmental factors surrounding maternal alcohol consumption. This supports the suggestion that alcohol exposure through breastmilk can reduce cognition in children.

    No relationship between maternal tobacco smoking and MR scores was found in wave 1 breastfed infants or infants who had been breastfed at any time at any wave. Likewise, no associations were observed between maternal alcohol or cigarette use and adapted PPVT-III or WAI scores for either group at any wave. The suggestion that smoking tobacco during lactation reduces cognition in children was not supported.

    Although no directly comparable previous research exists, Little et al34 found reduced developmental scores in children of mothers who drank while breastfeeding. The authors of a case study of a breastfed infant who developed a pseudo-Cushing syndrome also found that symptoms abated once maternal alcohol was ceased. Because the infant had no prenatal alcohol exposure, this suggests that alcohol exposure through breastmilk can directly impact children’s development.33 Additionally, prenatal alcohol exposure is more consistently associated with executive dysfunction than language or numeracy impairments.4 This is consistent with the observed reductions in MR scores but not the language- or numeracy-based measures.

    Although current analyses found an association between increased or riskier alcohol consumption while breastfeeding and MR scores, the mechanism is unclear. Consistent with animal models, ethanol in breastmilk may interfere with normal brain development.28–31 Increased cerebral cortex apoptosis and necrosis,30 for example, may disrupt higher order executive skills relied on in reasoning tasks. Likewise, decreased myelination31 could reduce the processing speed needed to problem solve quickly. Alternatively, reduced cognition may be secondary to changes in feeding and sleeping.5,32 Alterations in nutritional intake and sleep patterns may modify brain development or cause behavioral changes that reduce exposure to enriching stimuli.

    The relationship between increased alcohol exposure through breastmilk and decreased cognition was not evident at waves 5 to 6. Because older age also ceased to be predictive of wave 6 MR scores, the effects of age and alcohol may be mediated by factors such as increased education. Because learning difficulties were associated with lower wave 6 MR scores, alcohol may also indirectly alter cognition by contributing to developmental disorders in older children.

    Interestingly, despite known teratogenic effects,1,3 no association between prenatal alcohol exposure and children’s cognition was observed. This may be related to the small quantities and infrequency of prenatal alcohol consumption. Furthermore, prenatal binge drinking of alcohol was not recorded and has been associated with reduced cognition in children.2 The size of the observed relationship between alcohol exposure through breastmilk and cognition was also small, and clinical implications may be limited unless mothers drink large quantities or frequently binge drink. Additionally, given this small effect, the sample size of infants who had never breastfed may have been too small to detect a relationship, despite attempts to maximize power.

    There are several other limitations. The frequency and quantity of milk consumed by infants was not recorded, nor was the timing of alcohol consumption or the amount of ethanol in breastmilk. The impact of this is unknown, however, because not all women time their alcohol consumption to limit alcohol exposure, and unpredictable infant feeding patterns can interfere with timing attempts.20

    Although wave 1 alcohol consumption was recorded contemporaneously, pregnancy alcohol measures were retrospective. Although both are likely to be underestimates,18 retrospective measures may be even less accurate. Furthermore, measures of wave 1 and pregnancy alcohol differed, preventing direct comparisons.

    Cognitive measures available from LSAC were limited. A more comprehensive assessment of cognition including executive functioning, processing speed, learning and memory, visuospatial abilities, and basic as well as complex attention would have been beneficial.

    Conclusions

    Increased or riskier maternal alcohol consumption during lactation was associated with dose-dependent reductions in abstract reasoning at age 6 to 7 years. This relationship was not observed in infants who had never breastfed, suggesting a direct relationship between alcohol exposure through breastmilk and decreased cognition. The association was not evident at ages 8 to 11 years, which may relate to increased education in older children. Alternatively, because learning difficulties predicted lower MR scores at ages 10 to 11 years, alcohol may be associated with developmental disorders that contribute to these difficulties. Further analyses of LSAC data are planned to assess this possibility as well as relationships between alcohol exposure through breastmilk and academic, physical, and behavioral outcomes in children. Future research should also be focused on direct measures of alcohol in breastmilk and use more comprehensive cognitive assessments.

    Acknowledgments

    In this article, we used unit record data from Growing Up in Australia, the Longitudinal Study of Australian Children. The study was conducted in partnership between the Department of Social Services, the Australian Institute of Family Studies, and the Australian Bureau of Statistics. The findings and views reported in this article are those of the author and should not be attributed to Department of Social Services, Australian Institute of Family Studies, or the Australian Bureau of Statistics.

    Footnotes

      • Accepted April 9, 2018.
    • Address correspondence to Louisa Gibson, Grad Dip Psych, BSc(Psych) Hons, Department of Psychology, Human Sciences, Macquarie University, Balaclava Rd, North Ryde, NSW 2109, Australia. E-mail: louisa.gibson{at}hdr.mq.edu
    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: No external funding.

    • 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.2018-1377.

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    Drinking or Smoking While Breastfeeding and Later Cognition in Children
    Louisa Gibson, Melanie Porter
    Pediatrics Aug 2018, 142 (2) e20174266; DOI: 10.1542/peds.2017-4266

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    Drinking or Smoking While Breastfeeding and Later Cognition in Children
    Louisa Gibson, Melanie Porter
    Pediatrics Aug 2018, 142 (2) e20174266; DOI: 10.1542/peds.2017-4266
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