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Spina V, Baldini E, Cardarelli S, Oliva C, Venarubea S, Faraoni F, Pastore G, Tittoni R, Musella A, Squarcella A, Lori E, Renzi E, Feroci R, Mastrodonato F, Ciferri F, Virili C, Centanni M, Fabiani C, Rago R, Schiavi MC, Palazzetti P, D'Armiento E, Cantisani V, Sorrenti S, Ulisse S. Iodized Salt May Not Be Sufficient to Guarantee an Adequate Iodine Intake in Pregnant Women. Nutrients 2023; 15:4182. [PMID: 37836466 PMCID: PMC10574232 DOI: 10.3390/nu15194182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 09/20/2023] [Accepted: 09/25/2023] [Indexed: 10/15/2023] Open
Abstract
Adequate iodine intake is of crucial importance in pregnancy to meet the thyroid hormone needs of both mother and fetus. In the present study, undertaken as a part of the surveillance actions following the introduction in Italy of a national salt iodination program in 2005, the iodine intake was investigated in 123 pregnant women and 49 control women living in the same area of central Italy. All the participants were screened for urinary iodine concentration (UIC), serum level of thyrotropin, free-thyroxine, free-triiodothyronine, and thyroid volume. Moreover, they were provided with a questionnaire on the use of iodine-containing salt or supplements. Control women had a median UIC of 102 µg/L, consistent with an iodine sufficiency, while in pregnant women the median UIC value was 108 µg/L, lower than the endorsed UIC of 150 µg/L. In addition, pregnant women showed a significantly increased median thyroid volume compared to controls. Interestingly, the median UIC did not differ between pregnant women not using iodine-containing salt or supplements and those regularly consuming iodized salt alone, while pregnant women with a daily intake of iodine-containing supplements had an adequate median UIC (168 µg/L). In conclusion, the data reported here showed that pregnant women and their fetuses are still exposed to the detrimental effects of iodine deficiency and that the consumption of iodine-containing supplements should be recommended in pregnancy.
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Affiliation(s)
- Vincenzo Spina
- Mother and Infant Department Unit, ASL-Rieti, 02100 Rieti, Italy
| | - Enke Baldini
- Department of Surgery, "Sapienza" University of Rome, 00185 Rome, Italy
| | - Silvia Cardarelli
- Department of Surgery, "Sapienza" University of Rome, 00185 Rome, Italy
| | - Cosimo Oliva
- Obstetrics and Gynaecology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Stefano Venarubea
- Clinical Pathology Laboratory Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Franca Faraoni
- Pediatrics and Neonatology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Giovanni Pastore
- Obstetrics and Gynaecology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Rachele Tittoni
- Obstetrics and Gynaecology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Angela Musella
- Obstetrics and Gynaecology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Antonia Squarcella
- Obstetrics and Gynaecology Unit, "S. Camillo De Lellis" Hospital, 02100 Rieti, Italy
| | - Eleonora Lori
- Department of Surgery, "Sapienza" University of Rome, 00185 Rome, Italy
| | - Elisabetta Renzi
- Mother and Infant Department Unit, ASL-Rieti, 02100 Rieti, Italy
| | - Roberta Feroci
- Mother and Infant Department Unit, ASL-Rieti, 02100 Rieti, Italy
| | | | - Fabiola Ciferri
- Mother and Infant Department Unit, ASL-Rieti, 02100 Rieti, Italy
| | - Camilla Virili
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome, 04100 Latina, Italy
| | - Marco Centanni
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome, 04100 Latina, Italy
| | - Cristina Fabiani
- Mother and Infant Department, "Sandro Pertini" Hospital, 00157 Rome, Italy
| | - Rocco Rago
- Mother and Infant Department, "Sandro Pertini" Hospital, 00157 Rome, Italy
| | | | | | - Eleonora D'Armiento
- Department of Internal Medicine and and Medical Specialties, "Sapienza" University of Rome, 00185 Rome, Italy
| | - Vito Cantisani
- Department of Radiological and Oncological Sciences and Pathological Anatomy, "Sapienza" University of Rome, 00185 Rome, Italy
- Teleradiology Complex Unit, ASL-Rieti, 02100 Rieti, Italy
| | | | - Salvatore Ulisse
- Department of Surgery, "Sapienza" University of Rome, 00185 Rome, Italy
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Wan S, Jin B, Ren B, Boah M, Shen H. Relationship between mild iodine deficiency in pregnant women and thyroid function: A meta-analysis. J Trace Elem Med Biol 2023; 78:127197. [PMID: 37209527 DOI: 10.1016/j.jtemb.2023.127197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 04/27/2023] [Accepted: 05/05/2023] [Indexed: 05/22/2023]
Abstract
BACKGROUND Pregnant women are among the key groups in iodine nutrition evaluation. The purpose of the present study was to summarize the evidence supporting the relationship between mild iodine deficiency (UIC: 100-150 μg/L) in pregnant women and levels of thyroid function tests. METHODS This review follows the guidelines for systematic reviews (PRISMA 2020). Three electronic databases (PubMed, Medline, and Embase) were searched for relevant publications in English on the association between mild iodine deficiency in pregnant women and thyroid function. Articles published in Chinese were searched in China's electronic databases (CNKI, WanFang, CBM, and WeiPu). Pooled effects were presented as standardized mean differences (SMDs) and odds ratios (ORs) with 95% confidence intervals (CIs) using fixed or random effect models, respectively. This meta-analysis was registered at www.crd.york.ac.uk/prospero as CRD42019128120. RESULTS We summarized the results from 7 articles with 8261 participants. The overall pooled results showed that the levels of FT3, FT4, and abnormal TgAb (the antibody levels exceeded the upper limit of the reference range) were significantly increased in pregnant women with mild iodine deficiency compared to pregnant women with adequate iodine status (FT3: SMD=0.854, 95% CI: 0.188, 1.520; FT4: SMD=0.550, 95% CI: 0.050, 1.051; TgAb: OR=1.292, 95% CI: 1.095; 1.524). Subgroup analysis was carried out on the sample size, ethnicity, country, and gestation of FT3, FT4, and TSH, but no plausible factor was found. Egger's tests indicated no publication bias.The increase in FT3 and FT4, as well as TgAb levels, in pregnant women is associated with mild iodine deficiency. CONCLUSION Mild iodine deficiency is associated with an increase in FT3,FT4 and TgAb levels in pregnant women. Mild iodine deficiency may increase the risk of thyroid dysfunction in pregnant women.
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Affiliation(s)
- Siyuan Wan
- Department of Preventive Medicine, Qiqihar Medical University, Qiqihar, Heilongjiang, China.
| | - Baiming Jin
- Department of Preventive Medicine, Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Bingxuan Ren
- Centre for Endemic Disease Control, Chinese Centre for Disease Control and Prevention, Harbin Medical University, Harbin, Heilongjiang, China
| | - Michael Boah
- Department of Epidemiology, Biostatistics and Disease Control, School of Public Health, University for Development Studies, Tamale, Ghana
| | - Hongmei Shen
- Centre for Endemic Disease Control, Chinese Centre for Disease Control and Prevention, Harbin Medical University, Harbin, Heilongjiang, China.
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Little CC, Barlow J, Alsen M, van Gerwen M. Association between polychlorinated biphenyl exposure and thyroid hormones: a systematic review and meta-analysis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, TOXICOLOGY AND CARCINOGENESIS 2022; 40:248-267. [PMID: 36515092 DOI: 10.1080/26896583.2022.2149213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Purpose: To conduct a comprehensive meta-analysis investigating the association between polychlorinated biphenyl (PCB) exposure and serum thyroid hormone levels among adults. Methods: Eleven studies met inclusion criteria for analysis following systematic search of PubMed, Embase, and Scopus databases. Of these, 7 studies measured exposure by the total sum of PCB congeners (∑PCB), 1 study measured individual PCB congener levels, and 3 studies measured both ∑PCB levels and PCB congener levels. Correlation coefficients (r) were extracted from each study. Summary estimates were calculated for ∑PCB levels and PCB congeners reported by 2 or more studies: PCB 28, 52, 101, 105, 118, 138, 153, and 180, using random effects model. Results: Significant negative correlation was found between ∑PCBs and T3 (r: -0.09; 95% CI: -0.17, -0.02) and FT3 (r: -0.24; 95% CI: -0.36, -0.12). Congener-specific analysis found T3 to be negatively correlated with PCB-153 (r: -0.19; 95% CI: -0.34, -0.03) and PCB-180 (r: -0.14; 95% CI: -0.26, -0.01), whereas TSH was positively correlated with PCB-105 (r: 0.15; 95% CI: 0.02, 0.28). Conclusions: The present study is the first meta-analysis to investigate the association between PCB exposure and thyroid hormone dysfunction among adults. Results suggest a significant association between PCB exposure and thyroid hormone dysregulation.
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Affiliation(s)
- Christine C Little
- Department of Medical Education, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Joshua Barlow
- Department of Medical Education, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mathilda Alsen
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Maaike van Gerwen
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Institute for Translational Epidemiology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Ramezani Tehrani F, Nazarpour S. Delivery factors and neonatal thyroid hormone levels: a systematic review. J Pediatr Endocrinol Metab 2021; 34:821-833. [PMID: 33882204 DOI: 10.1515/jpem-2020-0740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/28/2021] [Indexed: 12/18/2022]
Abstract
Postnatal thyroid hormone changes enable the neonate to be adapted for postnatal life. Several factors can affect this adaption. In this review, we summarized the studies that reported the association among the delivery factors and neonatal thyroid hormones and thyroid stimulating hormone. A comprehensive literature search was performed in PubMed, Web of Science, and Scopus up to March 2020, to identify the studies investigating the relationship between delivery factors, especially the mode of delivery and labor pain, and neonatal thyroid hormones and TSH. Finally, in this review study, of 157 articles obtained in the initial search, 25 eligible studies were reviewed. Various maternal, fetal/neonatal, and obstetric factors affected neonatal TSH and thyroid hormones. Among various influencing factors, mode of delivery, labor pains, and duration of labor have a strong relationship with neonatal thyroid hormones and need to be considered for interpretation of neonatal thyroid status. The majority of the studies revealed that vaginal deliveries (instrumental or natural) lead to higher levels of cord TSH compared to elective cesarean section. This can be explained by the increased secretion of catecholamine during labor. It has been suggested that blood TSH and thyroid hormone levels are affected by perinatal stress events such as maternal anxiety, labor pains, fetal distress, and other stimulants of the catecholamine response. These changes may act as the trigger to increase thyroid hormone levels for adapting of neonates in the first hours after birth. This assumption needs to be re-evaluated by performing comprehensive and well-designed studies.
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Affiliation(s)
- Fahimeh Ramezani Tehrani
- Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sima Nazarpour
- Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Department of Midwifery, College of Medical Sciences, Varamin-Pishva Branch, Islamic Azad University, Tehran, Iran
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Bulur O, Atak Z, Ertugrul DT, Beyan E, Gunakan E, Karakaya S, Sahin K, Dal K. Trimester-specific reference intervals of thyroid function tests in Turkish pregnants. Gynecol Endocrinol 2020; 36:413-416. [PMID: 31532263 DOI: 10.1080/09513590.2019.1666817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Physiological changes in hormone levels occur in thyroid gland during pregnancy. Screening of the thyroid hormone levels and determining trimester-specific reference intervals in pregnancy are important. Guidelines recommend the use of trimester-specific reference ranges for each country. The aim of this study is to determine trimester-specific thyroid function reference intervals for pregnancy in Turkish population. In total, 5000 patients were screened out of which 1258 patients have all of fT3, fT4 and TSH levels measured, were included in the study. Patients were grouped as follows: 482 women were in first trimester, 361 women were in second trimester, and 415 women were in third trimester. All analyses were performed by means of chemiluminescence methods (Liaison®; DiaSorin S.p.A., Saluggia, Italy). The TSH reference intervals were 0.005-3.65, 0.01-3.63, and 0.2-3.46 mIU/L at the first, the second, and the third trimesters of pregnancy, respectively. The fT4 reference intervals were 0.72-1.79, 0.71-1.26, and 0.65-1.12 ng/dL at the first, the second, and the third trimesters, respectively. The fT3 reference intervals were 2.45-4.03, 2.37-3.85, and 2.31-3.77 ng/dL at the first, the second, and the third trimesters, respectively. It is crucial to determine population- and gestational-specific reference intervals for trustworthy treatment of pregnants.
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Affiliation(s)
- Oktay Bulur
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Zeliha Atak
- Department of Obstetrics and Gynecology, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Derun Taner Ertugrul
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Esin Beyan
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Emre Gunakan
- Department of Obstetrics and Gynecology, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Serdar Karakaya
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Kubilay Sahin
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
| | - Kursat Dal
- Department of Internal Medicine, Ankara Kecioren Egitim ve Arastirma Hastanesi, Ankara, Turkey
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Donovan LE, Metcalfe A, Chin A, Yamamoto JM, Virtanen H, Johnson JA, Krause R. A Practical Approach for the Verification and Determination of Site- and Trimester-Specific Reference Intervals for Thyroid Function Tests in Pregnancy. Thyroid 2019; 29:412-420. [PMID: 30595114 DOI: 10.1089/thy.2018.0439] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Population-, assay-, and trimester-specific reference intervals for thyroid function tests are necessary to assess thyroid status accurately and manage thyroid disease throughout pregnancy. This study's objective was to verify if the manufacturer's recommended trimester-specific reference intervals for thyroid tests and the American Thyroid Association's recommended total thyroxine (TT4) pregnancy reference intervals were verifiable and appropriate for use in the authors' multicultural population. METHODS Blood samples were obtained from the following sources: stored frozen surplus blood from women undergoing routine aneuploidy screening (first- and second-trimester samples, n = 274), women participating in an observational cohort study (second- and third-trimester samples, n = 135), and blood collected from women presenting for assessment to the labor and delivery ward (third-trimester samples, n = 35). Exclusions included thyroid medication or disease and positive thyroid peroxidase antibodies (anti-TPO). Samples were analyzed for thyrotropin (TSH), free T4 (fT4), free triiodothyronine (fT3), TT4, and anti-TPO using the Roche Cobas 8000 Modular e602 electrochemiluminescence immunoassay. RESULTS Nine percent of the aneuploidy screening samples were excluded prior to thyroid testing due to maternal use of thyroid medication. Six percent of analyzed samples were excluded: 5.9% with positive anti-TPO and one with a TSH >10 mIU/L. The manufacturer's recommended trimester-specific reference intervals for TSH were not verified by described standardized methods. Therefore, 95th percentile reference intervals were determined using a minimum number of samples. Reference intervals for TSH and fT4 were as follows: 9-12 weeks, 0.18-2.99 mIU/L and 11-19.2 pmol/L; second trimester, 0.11-3.98 mIU/L and 10.5-18.2 pmol/L; and third trimester, 0.48-4.71 mIU/L and 9.0-16.1 pmol/L, respectively. The TT4 reference interval after 19 weeks' gestation was 77-186 nmol/L. CONCLUSIONS This study provides a simple approach to verify or establish trimester-specific thyroid function reference intervals in local populations. The TT4 reference interval was lower than the interval proposed by the American Thyroid Association, suggesting the need for further study of TT4 in pregnancy and reliance on locally established fT4 reference intervals after 19 weeks, especially when there are no equivalent reference intervals for TT4.
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Affiliation(s)
- Lois E Donovan
- 1 Department of Medicine, University of Calgary Cumming School of Medicine, Calgary, Canada
- 2 Department of Obstetrics and Gynecology, University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Amy Metcalfe
- 1 Department of Medicine, University of Calgary Cumming School of Medicine, Calgary, Canada
- 2 Department of Obstetrics and Gynecology, University of Calgary Cumming School of Medicine, Calgary, Canada
- 3 Department of Community Health Sciences, University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Alex Chin
- 4 Department of Pathology and Laboratory Medicine, and University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Jennifer M Yamamoto
- 1 Department of Medicine, University of Calgary Cumming School of Medicine, Calgary, Canada
- 2 Department of Obstetrics and Gynecology, University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Heidi Virtanen
- 5 Department of Pediatrics, University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Jo-Ann Johnson
- 2 Department of Obstetrics and Gynecology, University of Calgary Cumming School of Medicine, Calgary, Canada
| | - Richard Krause
- 4 Department of Pathology and Laboratory Medicine, and University of Calgary Cumming School of Medicine, Calgary, Canada
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Fan P, Luo ZC, Tang N, Wang W, Liu Z, Zhang J, Ouyang F. Advanced Maternal Age, Mode of Delivery, and Thyroid Hormone Levels in Chinese Newborns. Front Endocrinol (Lausanne) 2019; 10:913. [PMID: 31998241 PMCID: PMC6966407 DOI: 10.3389/fendo.2019.00913] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 12/16/2019] [Indexed: 12/22/2022] Open
Abstract
Objective: Thyroid hormones are essential for fetal growth and neurodevelopment, however, data on cord blood thyroid hormones are sparse in China where maternal age at childbearing is increasing in recent decades. We aimed to assess cord blood levels of free triiodothyronine (FT3), free thyroxine (FT4), and thyroid stimulating hormone (TSH) in full-term Chinese newborns, and examine potential related perinatal factors. Methods: This study included 922 mother-newborn pairs from a prospective birth cohort enrolled in 2012-2013, Shanghai, China. Cord serum concentrations of FT3, FT4, TSH, and TPOAb were measured in newborns. Results: Newborns born via cesarean section had higher cord serum FT3 (mean ± SD: 1.90 ± 1.16 pmol/L) and lower cord serum TSH (5.15 ± 2.60 mIU/L) than those born via vaginal delivery (FT3: 1.62 ± 0.93 pmol/L; TSH: 9.27 ± 6.76 mIU/L). In cesarean section deliveries, the concentration of cord serum FT3 was 0.15 (95%CI: -0.03, 0.33; p = 0.10) pmol/L lower in infants of mothers aged 30-34 years, and 0.57 (95%CI: 0.22, 0.92; p = 0.002) pmol/L lower in infants of mothers ≥35 years compared to infants of mothers <30 years. Large-for-gestational-age (birth weight >90th percentile) was associated with higher TSH (p = 0.02). Similar results were also found in vaginal deliveries. Conclusions: In this Chinese term birth cohort, newborns born via cesarean section had higher cord serum FT3 and lower TSH than those born via vaginal delivery. Advanced maternal age was associated with lower fetal FT3. Further research is needed to understand whether this association may mediate the adverse impact of advanced maternal age on neurodevelopment in early life.
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Affiliation(s)
- Pianpian Fan
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhong-Cheng Luo
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Obstetrics and Gynecology, Prosserman Centre for Population Health Research, Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
| | - Ning Tang
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiye Wang
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhiwei Liu
- Department of Neonatology, International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jun Zhang
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Fengxiu Ouyang
- Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- *Correspondence: Fengxiu Ouyang ;
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