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Arabzadeh H, Doosti-Irani A, Kamkari S, Farhadian M, Elyasi E, Mohammadi Y. The maternal factors associated with infant low birth weight: an umbrella review. BMC Pregnancy Childbirth 2024; 24:316. [PMID: 38664680 PMCID: PMC11044292 DOI: 10.1186/s12884-024-06487-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 04/05/2024] [Indexed: 04/29/2024] Open
Abstract
BACKGROUND In this umbrella review, we systematically evaluated the evidence from meta-analyses and systematic reviews of maternal factors associated with low birth weight. METHODS PubMed, Scopus, and Web of Science were searched to identify all relevant published studies up to August 2023. We included all meta-analysis studies (based on cohort, case-control, cross-sectional studies) that examined the association between maternal factors (15 risk factors) and risk of LBW, regardless of publication date. A random-effects meta-analysis was conducted to estimate the summary effect size along with the 95% confidence interval (CI), 95% prediction interval, and heterogeneity (I2) in all meta-analyses. Hedges' g was used as the effect size metric. The effects of small studies and excess significance biases were assessed using funnel plots and the Egger's test, respectively. The methodological quality of the included studies was assessed using the AMSTAR 2 tool. RESULTS We included 13 systematic Review with 15 meta-analysis studies in our study based on the inclusion criteria. The following 13 maternal factors were identified as risk factors for low birth weight: crack/cocaine (odds ratio [OR] 2.82, 95% confidence interval [CI] 2.26-3.52), infertility (OR 1.34, 95% CI 1.2-1.48), smoking (OR 2.00, 95% CI 1.76-2.28), periodontal disease (OR 2.41, 95% CI 1.67-3.47), depression (OR 1.84, 95% CI 1.34-2.53), anemia (OR 1.32, 95% CI 1.13-1.55), caffeine/coffee (OR 1.34, 95% CI 1.14-1.57), heavy physical workload (OR 1.87, 95% CI 1.00-3.47), lifting ≥ 11 kg (OR 1.59, 95% CI 1.02-2.48), underweight (OR 1.79, 95% CI 1.20-2.67), alcohol (OR 1.23, 95% CI 1.04-1.46), hypertension (OR 3.90, 95% CI 2.73-5.58), and hypothyroidism (OR 1.40, 95% CI 1.01-1.94). A significant negative association was also reported between antenatal care and low birth weight. CONCLUSIONS This umbrella review identified drug use (such as crack/cocaine), infertility, smoking, periodontal disease, depression, caffeine and anemia as risk factors for low birth weight in pregnant women. These findings suggest that pregnant women can reduce the risk of low birth weight by maintaining good oral health, eating a healthy diet, managing stress and mental health, and avoiding smoking and drug use.
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Affiliation(s)
- Hoda Arabzadeh
- Department of Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Amin Doosti-Irani
- Department of Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
- Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Sima Kamkari
- Department of Obstetrics and Gynecology, Fatemiyeh Hospital Research Center, Hamadan, Iran
| | - Maryam Farhadian
- Department of Biostatistics, School of Public Health, Hamadan University of Medical Science, Hamadan, Iran
| | - Elahe Elyasi
- Department of Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Younes Mohammadi
- Department of Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
- Modeling of Noncommunicable Diseases Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
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Abreu RWFD, Lima CRG, Verdério BN, Santos MMD, Dos Santos AN, Brugnaro BH, Rocha NACF. Association between environmental factors during the COVID-19 pandemic and functioning of infants with biological risk in the first year of life: Cross-sectional exploratory study. Early Hum Dev 2024; 191:105987. [PMID: 38520911 DOI: 10.1016/j.earlhumdev.2024.105987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 03/25/2024]
Abstract
BACKGROUND Child development can be influenced by family and environmental factors, which changed during the COVID-19 pandemic. Thus, it is important to explore how these factors are associated with the functioning of infants with biological risk in the first year of life. OBJECTIVE This study aimed to investigate associations between family factors, home opportunities, caregiver perception of environmental support and barriers at home and environmental factors during the COVID-19 pandemic and gross motor skills and home participation in infants with biological risk in the first year of life. METHODS Fifty-six infants aged two to 12 months (M = 5.80 months; ±2.44) and their mothers performed remote assessments of gross motor skills using the Alberta Infant Motor Scale (AIMS); participation and environment (phone call) by the Young Children's Participation and Environment Measure (YC-PEM); family factors (income, age and maternal education), home opportunities - The Affordances in the Home Environment for Motor Development - Infant Scale (AHEMD-IS) and environmental factors during the COVID-19 pandemic (social distancing, emotional and financial factors and physiotherapy) (online forms). Regression models were constructed, considering gross motor skills and home participation as outcome variables, with a 5 % significance level. RESULTS We found that older maternal age (p = 0.001), more home opportunities (p = 0.043), and less rigorous social distancing (as opposed to total social distancing [p = 0.045]) were significantly associated with better gross motor skills; and higher maternal education (p = 0.050) was associated with more involvement in home activities. CONCLUSION Family factors, home opportunities and social distancing were differently associated with the gross motor skills and home participation of infants with biological risk in the first year of life.
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Affiliation(s)
- Raissa Wanderley Ferraz de Abreu
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
| | - Camila Resende Gâmbaro Lima
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
| | - Bruna Nayara Verdério
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
| | - Mariana Martins Dos Santos
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
| | - Adriana Neves Dos Santos
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil; Departament of Health Science, Federal University of Santa Catarina (UFSC), Araranguá, SC, Brazil.
| | - Beatriz Helena Brugnaro
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
| | - Nelci Adriana Cicuto Ferreira Rocha
- Infant Development Analysis Laboratory (LADI), Departament of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil.
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Kim HY, Cho GJ, Ahn KH, Hong SC, Oh MJ, Kim HJ. Short-term neonatal and long-term neurodevelopmental outcome of children born term low birth weight. Sci Rep 2024; 14:2274. [PMID: 38280915 PMCID: PMC10821875 DOI: 10.1038/s41598-024-52154-9] [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: 08/23/2023] [Accepted: 01/15/2024] [Indexed: 01/29/2024] Open
Abstract
This study aimed to examine the impact of term LBW on short-term neonatal and long-term neurodevelopmental outcomes in children 5-7 years of age. This is a population-based cohort study that merged national data from the Korea National Health Insurance claims and National Health Screening Program for Infants and Children. The participants were women who gave birth at a gestational age of ≥ 37 weeks between 2013 and 2015 in the Republic of Korea, and were tracked during 2020 for the neurodevelopmental surveillance of their children. Among 830,806 women who gave birth during the study period, 31,700 (3.8%) of their babies weighed less than 2500 g. By Cox proportional hazard analysis, children aged 5-7 years who had LBW were associated with any developmental, motor developmental delay, cognitive developmental delay, autism spectrum, attention deficit hyperactivity disorders, and epileptic and febrile seizures.Children born with term LBW were more vulnerable to neurodevelopmental disorders at 5-7 years of age than those with normal and large birth weights. This study further substantiates counseling parents regarding the long-term outcomes of children being born underweight.
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Affiliation(s)
- Ho Yeon Kim
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea
| | - Geum Joon Cho
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea.
| | - Ki Hoon Ahn
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea
| | - Soon-Cheol Hong
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea
| | - Min-Jeong Oh
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea
| | - Hai-Joong Kim
- Department of Obstetrics and Gynecology, Korea University College of Medicine, 148 Gurodong-Ro, Guro-Gu, Seoul, 08308, Republic of Korea
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Hossain SJ, Hamadani JD, Tofail F, Fisher J, Rahman MA, Rahman SM. Factors associated with children's cognitive, language, and motor development in deprived urban settings in Bangladesh. Child Care Health Dev 2024; 50:e13225. [PMID: 38265136 DOI: 10.1111/cch.13225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 10/30/2023] [Accepted: 12/17/2023] [Indexed: 01/25/2024]
Abstract
BACKGROUND Children's development is multifactorial. Although there have been several studies exploring the association of children's development with maternal, child, and environmental factors, we are unaware of any study that assessed those factors in children whose mothers were enrolled in a social safety net programme in low- and middle-income countries. This study aimed to identify the factors associated with disadvantaged children's cognitive, language, and motor development at age 6-16 months in deprived settings of urban Bangladesh and to identify relative importance of these factors of children's development. We also explored if there were any gender differences in child development. METHODS This cross-sectional study was conducted in a deprived setting of urban Bangladesh. Bayley III was used for assessing children's cognitive, language, and motor development. Multivariable linear regression model was used to find the factors associated with children's development, and dominance analysis was used to explore the relative importance of the factors. RESULTS Out of the total 599 mother-child dyads, 303 (50.58%) were girls. The factors associated with children's development were length-for-age Z-score (cognitive: B = 1.21 [95% CI = 0.31, 2.11], P = 0.008; language: 1.67 [0.79, 2.55] P < 0.001; motor: 2.15 [1.01, 3.29] P < 0.001) and home environment (cognitive: 0.58 [0.27, 0.89] P < 0.001; language: 0.59 [0.27, 0.92], P < 0.001; motor: 0.44 [0.09, 0.79] P = 0.013). Girls had higher cognitive (1.90 [0.17, 3.6], P = 0.031) and language (2.53 [0.55, 4.51], P = 0.013) development compared with boys. Families with a higher number of under five children within the households had lower language (-1.57 [-2.78, -0.36], P = 0.011) development. Violence against the mother and the families' food security status were not associated with the children's development. Children's length-for-age Z-score (27%) and home stimulation environment (23%) were the most important factors of cognitive development. CONCLUSION Children's nutritional status and home environment are important factors for disadvantaged children's development in deprived urban settings of Bangladesh. Both early child development-focussed parenting and nutrition interventions should be considered when designing child development programmes in urban settings in low- and middle-income countries.
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Affiliation(s)
- Sheikh Jamal Hossain
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
- International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Mohakhali, Bangladesh
| | | | - Fahmida Tofail
- International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Mohakhali, Bangladesh
| | - Jane Fisher
- Global and Women's Health, School of Public Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia
| | - Md Anisur Rahman
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
- International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Mohakhali, Bangladesh
| | - Syed Moshfiqur Rahman
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
- International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Mohakhali, Bangladesh
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Pennock E, Slack EL, Grebby JA, Forster LN, Pearce MS. Associations between early infections and childhood cognition in the Newcastle Thousand Families Study birth cohort. J Dev Orig Health Dis 2023; 14:648-657. [PMID: 38017690 DOI: 10.1017/s2040174423000338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
Childhood infections have been shown to stunt growth, contribute to malnutrition and reduce cognition in early adulthood. This study aimed to assess relationships between early life infections and childhood cognition at age 11 years in the Newcastle Thousand Families Study (NTFS). The analysis included 741 members from the NTFS who had complete data for infections between birth and 5 years, and the 11-plus examinations. School records from the 11-plus examinations showed cognitive (IQ), English (EQ) and arithmetic (AQ) abilities. Housing conditions, overcrowding, birth order and social class were recorded at birth. Helicobacter pylori seropositivity was measured at age 49-51 years. Multivariable linear regression was used to examine relationships between infections and cognition. The total number of infections in the first 5 years of life was not significantly associated with IQ, EQ or AQ, nor were there significant relationships between cognitive outcomes and most infections. Tonsillitis did display a positive, significant association with IQ after adjustment for confounders (b = 6.43, 95% CI 0.92, 11.94, p = 0.022). Lower respiratory tract infections (LRTIs) showed significant negative relationships with all cognitive outcomes. H. pylori seropositivity at age 50 exhibited negative, significant relationships with EQ (p = 0.014) and AQ (p = 0.024) after adjustment for confounders. Although no significant relationship between overall infections and cognition were found, there were indications that LRTIs and gastrointestinal system infections may limit cognitive development. Given these infections remain prevalent, further research regarding severity and recurrence of infections and how they affect childhood cognition is needed.
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Affiliation(s)
- Erin Pennock
- School of Biomedical, Nutritional and Sport Sciences, Newcastle University, Newcastle upon Tyne, UK
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Emma L Slack
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Jess A Grebby
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
- School of Psychology, Newcastle University, Newcastle upon Tyne, UK
| | - Lara N Forster
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
| | - Mark S Pearce
- Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
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Upadhyay RP, Taneja S, Strand TA, Hysing M, Koshy B, Bhandari N, Bahl R. Milk-cereal mix supplementation during infancy and impact on neurodevelopmental outcomes at 12 and 24 months of age: a randomised controlled trial in India. Br J Nutr 2023; 130:868-877. [PMID: 36539339 PMCID: PMC10404480 DOI: 10.1017/s0007114522003944] [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: 09/30/2022] [Revised: 11/30/2022] [Accepted: 12/10/2022] [Indexed: 12/24/2022]
Abstract
Inadequate protein intake and lack of micronutrients may affect neurodevelopment in infants. This randomised controlled trial was conducted to measure the effect of two milk-cereal mixes with modest and high amounts of protein and enriched with multiple micronutrients, given between 6 and 12 months, on cognitive, language, motor and behavioural scores at 12 and 24 months of age, compared with no-supplementation. The two supplements were also compared with each other. The study was conducted in urban Delhi, India, and the infants were randomised in a 1:1:1 ratio to the three study groups. At 12 and 24 months of age, 1134 and 1214 children were available, respectively. At 12 months of age, compared with no-supplement group, an increase in the motor scores (mean difference, MD 1·52, 95 % CI: 0·28, 2·75) and a decrease in the infant temperament scores (MD - 2·76, 95 % CI: -4·23, -1·29) in the modest-protein group was observed. Those in the high-protein group had lower socio-emotional scores (MD - 1·40, 95 % CI: -2·43, -0·37) and higher scores on Infant Temperament Scale (MD 2·05, 95 % CI: 0·62, 3·48) when compared with modest-protein group. At 24 months, no significant differences in any of the neurodevelopment scores between the three study groups was found. In conclusion, supplementation with modest amount of protein and multiple micronutrients may lead to short-term small improvements in motor function and infant temperament. There appears no advantage of supplementing with high protein, rather negative effects on infant behaviour were observed.
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Affiliation(s)
- Ravi Prakash Upadhyay
- Centre for Health Research and Development, Society for Applied Studies, New Delhi, India
- Department of Global Public Health and Primary Care, Centre for International Health, University of Bergen, Bergen, Norway
| | - Sunita Taneja
- Centre for Health Research and Development, Society for Applied Studies, New Delhi, India
| | - Tor Arne Strand
- Department of Research, Innlandet Hospital Trust, Lillehammer, Norway
| | - Mari Hysing
- Department of Psychosocial Science, Faculty of Psychology, University of Bergen, Bergen, Norway
| | - Beena Koshy
- Department of Developmental Pediatrics, Christian Medical College, Vellore, India
| | - Nita Bhandari
- Centre for Health Research and Development, Society for Applied Studies, New Delhi, India
| | - Rajiv Bahl
- Department of Maternal, Newborn, Child and Adolescent Health, World Health Organization, Geneva, Switzerland
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The associations between stunting and wasting at 12 months of age and developmental milestones delays in a cohort of Cambodian children. Sci Rep 2022; 12:17859. [PMID: 36284133 PMCID: PMC9596435 DOI: 10.1038/s41598-022-22861-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 10/20/2022] [Indexed: 01/20/2023] Open
Abstract
Worldwide, over 250 million children under 5 years do not reach their developmental potential due to several causes, including malnutrition. In Cambodia, the prevalence of stunting and wasting among children remains high. This prospective cohort study aimed to assess acquisition of motor and cognitive developmental milestones in early childhood and their associations with stunting and wasting. Children aged from 0 to 24 months were recruited from three provinces in Cambodia and followed up to seven times from March 2016 to June 2019, until their 5 years. Data collection included anthropometry and developmental milestones. Seven motor and seven cognitive milestones were evaluated using the Cambodian Development Milestone Assessment Tool. Associations were assessed with parametric survival models. Hazard ratios (HR) below 1 stood for lower probabilities for achieving developmental milestones. Data were available for 7394 children. At 12 months, the prevalence of stunting and wasting were 23.7% and 9.6% respectively. Both were consistently associated with delays in most motor and cognitive milestones. Stunting was strongly associated with delays in gross motor milestones (HR < 0.85; p < 0.001). Wasting was more strongly associated with delays in fine motor development and most cognitive milestones (HR < 0.75; p < 0.001). Promoting nutritional programs in the first 1000 days to prevent malnutrition is essential to further the optimal growth and motor and cognitive development of Cambodian children.
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Neurodevelopmental outcomes at 6, 12, and 24 months of age in preterm infants with very low birth weights in Taiwan. J Formos Med Assoc 2022; 121:1804-1812. [DOI: 10.1016/j.jfma.2022.02.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 02/06/2022] [Accepted: 02/14/2022] [Indexed: 12/25/2022] Open
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John HB, Arumugam A, Priya M, Murugesan N, Rajendraprasad N, Rebekah G, Paul P, Chandna J, Lawn JE, Santhanam S. South Indian children's neurodevelopmental outcomes after Group B Streptococcus invasive disease: A case cohort study. Clin Infect Dis 2021; 74:S24-S34. [PMID: 34558605 PMCID: PMC8775645 DOI: 10.1093/cid/ciab792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Background This study is part of a multicountry matched-cohort study designed to estimate the risk of long-term neurodevelopmental impairment (NDI) of children exposed to invasive group B Streptococcus (iGBS). The specific objective of this paper is to compare NDI across domains of iGBS survivors with a matched non iGBS group in our population. Methods Survivors of iGBS in a South Indian hospital were identified and recruited between January 2020 and April 2021. Cases were compared with age- and gender-matched non iGBS children. Participants were assessed using Bayley Scales of Infant and Toddler Development–3rd edition (BSID-III), Wechsler Preschool and Primary Scale of Intelligence–4th edition (WPPSI-IV), Wechsler Intelligence Scale for Children–5th edition (WISC-V), Child Behavior Checklist (CBCL), and Bruininks-Oseretsky Test of Motor Proficiency, 2nd edition (BOT-2), depending on age. Results Our cohort comprised 35 GBS-exposed and 65 matched non iGBS children, aged 1–14 years. The iGBS-exposed group had 17 (48.6%) children with impairment in ≥1 domain compared to 25 (38%) in the non iGBS group (unadjusted OR, 1.51; 95% CI, .65–3.46), 9 (26%) children with “multi-domain impairment” compared to 10 (15.4%) in the non iGBS group (unadjusted OR, 1.90; 95% CI, .69–5.24), and 1 (2.9%) child with moderate to severe impairment compared to 3 (4.6%) in the non iGBS group (unadjusted OR, .60; 95% CI, .06–6.07). In the iGBS group, more children had motor impairments compared with the non iGBS group (unadjusted OR, 10.7; 95% CI, 1.19–95.69; P = .034). Conclusions Children with iGBS seem at higher risk of developing motor impairments compared with a non iGBS group.
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Affiliation(s)
- Hima B John
- Department of Neonatology, Christian Medical College, Vellore
| | - Asha Arumugam
- Department of Neonatology, Christian Medical College, Vellore
| | - Mohana Priya
- Department of Neonatology, Christian Medical College, Vellore
| | | | | | - Grace Rebekah
- Department of Biostatistics, Christian Medical College, Vellore
| | - Proma Paul
- Maternal, Adolescent, Reproductive & Child Health (MARCH) Centre, London School of Hygiene & Tropical Medicine, London, UK.,Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
| | - Jaya Chandna
- Maternal, Adolescent, Reproductive & Child Health (MARCH) Centre, London School of Hygiene & Tropical Medicine, London, UK.,Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
| | - Joy E Lawn
- Maternal, Adolescent, Reproductive & Child Health (MARCH) Centre, London School of Hygiene & Tropical Medicine, London, UK.,Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK
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