Preconceptional Folate Supplementation and the Risk of Spontaneous Preterm Birth: A Cohort Study
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{"title"=>"Preconceptional folate supplementation and the risk of spontaneous preterm birth: A cohort study", "type"=>"journal", "authors"=>[{"first_name"=>"Radek", "last_name"=>"Bukowski", "scopus_author_id"=>"7102416022"}, {"first_name"=>"Fergal D.", "last_name"=>"Malone", "scopus_author_id"=>"7004913162"}, {"first_name"=>"Flint T.", "last_name"=>"Porter", "scopus_author_id"=>"21934884500"}, {"first_name"=>"David A.", "last_name"=>"Nyberg", "scopus_author_id"=>"56823935500"}, {"first_name"=>"Christine H.", "last_name"=>"Comstock", "scopus_author_id"=>"7005400580"}, {"first_name"=>"Gary D.V.", "last_name"=>"Hankins", "scopus_author_id"=>"7005601739"}, {"first_name"=>"Keith", "last_name"=>"Eddleman", "scopus_author_id"=>"6603666153"}, {"first_name"=>"Susan J.", "last_name"=>"Gross", "scopus_author_id"=>"7202651228"}, {"first_name"=>"Lorraine", "last_name"=>"Dugoff", "scopus_author_id"=>"6603580482"}, {"first_name"=>"Sabrina D.", "last_name"=>"Craigo", "scopus_author_id"=>"6701342459"}, {"first_name"=>"Ilan E.", "last_name"=>"Timor-Tritsch", "scopus_author_id"=>"7005780801"}, {"first_name"=>"Stephen R.", "last_name"=>"Carr", "scopus_author_id"=>"7202363605"}, {"first_name"=>"Honor M.", "last_name"=>"Wolfe", "scopus_author_id"=>"7103348661"}, {"first_name"=>"Mary E.", "last_name"=>"D'alton", "scopus_author_id"=>"7005738052"}], "year"=>2009, "source"=>"PLoS Medicine", "identifiers"=>{"sgr"=>"66349099018", "doi"=>"10.1371/journal.pmed.1000061", "pui"=>"354671552", "pmid"=>"19434228", "scopus"=>"2-s2.0-66349099018", "issn"=>"15491277", "isbn"=>"1549-1676 (Electronic)"}, "id"=>"d1370b18-e205-39e4-a4af-23bff99c4ea8", "abstract"=>"BACKGROUND Low plasma folate concentrations in pregnancy are associated with preterm birth. Here we show an association between preconceptional folate supplementation and the risk of spontaneous preterm birth. METHODS AND FINDINGS In a cohort of 34,480 low-risk singleton pregnancies enrolled in a study of aneuploidy risk, preconceptional folate supplementation was prospectively recorded in the first trimester of pregnancy. Duration of pregnancy was estimated based on first trimester ultrasound examination. Natural length of pregnancy was defined as gestational age at delivery in pregnancies with no medical or obstetrical complications that may have constituted an indication for delivery. Spontaneous preterm birth was defined as duration of pregnancy between 20 and 37 wk without those complications. The association between preconceptional folate supplementation and the risk of spontaneous preterm birth was evaluated using survival analysis. Comparing to no supplementation, preconceptional folate supplementation for 1 y or longer was associated with a 70% decrease in the risk of spontaneous preterm delivery between 20 and 28 wk (41 [0.27%] versus 4 [0.04%] spontaneous preterm births, respectively; HR 0.22, 95% confidence interval [CI] 0.08-0.61, p = 0.004) and a 50% decrease in the risk of spontaneous preterm delivery between 28 and 32 wk (58 [0.38%] versus 12 [0.18%] preterm birth, respectively; HR 0.45, 95% CI 0.24-0.83, p = 0.010). Adjustment for maternal characteristics age, race, body mass index, education, marital status, smoking, parity, and history of prior preterm birth did not have a material effect on the association between folate supplementation for 1 y or longer and spontaneous preterm birth between 20 and 28, and 28 to 32 wk (adjusted HR 0.31, 95% CI 0.11-0.90, p = 0.031 and 0.53, 0.28-0.99, p = 0.046, respectively). Preconceptional folate supplementation was not significantly associated with the risk of spontaneous preterm birth beyond 32 wk. The association between shorter duration (<1 y) of preconceptional folate supplementation and the risk of spontaneous preterm birth was not significant after adjustment for maternal characteristics. However, the risk of spontaneous preterm birth decreased with the duration of preconceptional folate supplementation (test for trend of survivor functions, p = 0.01) and was the lowest in women who used folate supplementation for 1 y or longer. There was also no significant association with other complications of pregnancy studied after adjustment for maternal characteristics. CONCLUSIONS Preconceptional folate supplementation is associated with a 50%-70% reduction in the incidence of early spontaneous preterm birth. The risk of early spontaneous preterm birth is inversely proportional to the duration of preconceptional folate supplementation. Preconceptional folate supplementation was specifically related to early spontaneous preterm birth and not associated with other complications of pregnancy.", "link"=>"http://www.mendeley.com/research/preconceptional-folate-supplementation-risk-spontaneous-preterm-birth-cohort-study-6", "reader_count"=>70, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>5, "Student > Doctoral Student"=>5, "Researcher"=>4, "Student > Ph. D. Student"=>8, "Student > Postgraduate"=>4, "Student > Master"=>16, "Other"=>5, "Student > Bachelor"=>13, "Professor"=>7}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>5, "Student > Doctoral Student"=>5, "Researcher"=>4, "Student > Ph. D. Student"=>8, "Student > Postgraduate"=>4, "Student > Master"=>16, "Other"=>5, "Student > Bachelor"=>13, "Professor"=>7}, "reader_count_by_subject_area"=>{"Unspecified"=>4, "Agricultural and Biological Sciences"=>11, "Arts and Humanities"=>1, "Chemical Engineering"=>1, "Computer Science"=>1, "Economics, Econometrics and Finance"=>1, "Engineering"=>2, "Biochemistry, Genetics and Molecular Biology"=>4, "Nursing and Health Professions"=>1, "Medicine and Dentistry"=>33, "Pharmacology, Toxicology and Pharmaceutical Science"=>2, "Physics and Astronomy"=>1, "Psychology"=>4, "Social Sciences"=>2, "Immunology and Microbiology"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>33}, "Social Sciences"=>{"Social Sciences"=>2}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>4}, "Unspecified"=>{"Unspecified"=>4}, "Pharmacology, Toxicology and Pharmaceutical Science"=>{"Pharmacology, Toxicology and Pharmaceutical Science"=>2}, "Chemical Engineering"=>{"Chemical Engineering"=>1}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Engineering"=>{"Engineering"=>2}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>11}, "Computer Science"=>{"Computer Science"=>1}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>4}}, "reader_count_by_country"=>{"Canada"=>1, "United States"=>1, "Brazil"=>1, "United Kingdom"=>1, "Switzerland"=>1}, "group_count"=>5}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/897978"], "description"=>"<p>ORs and 95% CIs of spontaneous preterm birth before 32 wk for preconceptional folate supplementation for ≥1 y, stratified for a given characteristic and adjusted for all other maternal characteristics. <i>p</i>-Values are estimated for interaction terms between duration of folate supplementation and given characteristic. The OR for BMI <18.5 could not be estimated, as there were no cases of spontaneous preterm birth before 32 wk among women using folate supplementation for ≥1 y and with BMI <18.5. MA, maternal age; Educ, completed years of education; PARA No PPTB, parous woman without a history of prior preterm birth; PARA PPTB, parous woman with a history of prior preterm birth.</p>", "links"=>[], "tags"=>["preconceptional", "folate", "supplementation", "spontaneous", "preterm", "32"], "article_id"=>568416, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.g004", "stats"=>{"downloads"=>3, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Stratified_analysis_of_association_between_preconceptional_folate_supplementation_8805_1_y_and_the_risk_of_spontaneous_preterm_birth_before_32_wk_/568416", "title"=>"Stratified analysis of association between preconceptional folate supplementation ≥1 y and the risk of spontaneous preterm birth before 32 wk.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-05-12 02:20:16"}
  • {"files"=>["https://ndownloader.figshare.com/files/444839", "https://ndownloader.figshare.com/files/444871"], "description"=>"<div><h3>Background</h3><p>Low plasma folate concentrations in pregnancy are associated with preterm birth. Here we show an association between preconceptional folate supplementation and the risk of spontaneous preterm birth.</p><h3>Methods and Findings</h3><p>In a cohort of 34,480 low-risk singleton pregnancies enrolled in a study of aneuploidy risk, preconceptional folate supplementation was prospectively recorded in the first trimester of pregnancy. Duration of pregnancy was estimated based on first trimester ultrasound examination. Natural length of pregnancy was defined as gestational age at delivery in pregnancies with no medical or obstetrical complications that may have constituted an indication for delivery. Spontaneous preterm birth was defined as duration of pregnancy between 20 and 37 wk without those complications. The association between preconceptional folate supplementation and the risk of spontaneous preterm birth was evaluated using survival analysis. Comparing to no supplementation, preconceptional folate supplementation for 1 y or longer was associated with a 70% decrease in the risk of spontaneous preterm delivery between 20 and 28 wk (41 [0.27%] versus 4 [0.04%] spontaneous preterm births, respectively; HR 0.22, 95% confidence interval [CI] 0.08–0.61, <em>p</em> = 0.004) and a 50% decrease in the risk of spontaneous preterm delivery between 28 and 32 wk (58 [0.38%] versus 12 [0.18%] preterm birth, respectively; HR 0.45, 95% CI 0.24–0.83, <em>p</em> = 0.010). Adjustment for maternal characteristics age, race, body mass index, education, marital status, smoking, parity, and history of prior preterm birth did not have a material effect on the association between folate supplementation for 1 y or longer and spontaneous preterm birth between 20 and 28, and 28 to 32 wk (adjusted HR 0.31, 95% CI 0.11–0.90, <em>p</em> = 0.031 and 0.53, 0.28–0.99, <em>p</em> = 0.046, respectively). Preconceptional folate supplementation was not significantly associated with the risk of spontaneous preterm birth beyond 32 wk. The association between shorter duration (<1 y) of preconceptional folate supplementation and the risk of spontaneous preterm birth was not significant after adjustment for maternal characteristics. However, the risk of spontaneous preterm birth decreased with the duration of preconceptional folate supplementation (test for trend of survivor functions, <em>p</em> = 0.01) and was the lowest in women who used folate supplementation for 1 y or longer. There was also no significant association with other complications of pregnancy studied after adjustment for maternal characteristics.</p><h3>Conclusions</h3><p>Preconceptional folate supplementation is associated with a 50%–70% reduction in the incidence of early spontaneous preterm birth. The risk of early spontaneous preterm birth is inversely proportional to the duration of preconceptional folate supplementation. Preconceptional folate supplementation was specifically related to early spontaneous preterm birth and not associated with other complications of pregnancy.</p></div>", "links"=>[], "tags"=>["preconceptional", "folate", "supplementation", "spontaneous", "preterm", "cohort"], "article_id"=>147650, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>["https://dx.doi.org/10.1371/journal.pmed.1000061.s001", "https://dx.doi.org/10.1371/journal.pmed.1000061.s002"], "stats"=>{"downloads"=>11, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Preconceptional_Folate_Supplementation_and_the_Risk_of_Spontaneous_Preterm_Birth_A_Cohort_Study/147650", "title"=>"Preconceptional Folate Supplementation and the Risk of Spontaneous Preterm Birth: A Cohort Study", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2009-05-12 02:07:30"}
  • {"files"=>["https://ndownloader.figshare.com/files/898169"], "description"=>"<p>No Folate, no preconceptional folate supplementation; Folate <1 yr, preconceptional folate supplementation for <1 year; Folate ≥1 yr, preconceptional folate supplementation for ≥1 year.</p><p>Adjusted for maternal age, body mass index, race and ethnicity, educational level, marital status, smoking, parity and history of prior preterm birth.</p><p>SGA, small for gestational age.</p>", "links"=>[], "tags"=>["sga", "placental", "preconceptional", "folate"], "article_id"=>568616, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.t004", "stats"=>{"downloads"=>5, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_of_SGA_infant_placental_abruption_and_preconceptional_folate_supplementation_/568616", "title"=>"Risk of SGA infant, placental abruption, and preconceptional folate supplementation.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-05-12 02:23:36"}
  • {"files"=>["https://ndownloader.figshare.com/files/898052"], "description"=>"a<p>Kruskal-Wallis test or test for trend as appropriate.</p>b<p>Nonspontaneous indicates preterm birth associated with complications of pregnancy constituting indications for delivery.</p>", "links"=>[], "tags"=>["characteristics", "outcomes", "preconceptional", "folate", "supplementation", "singleton"], "article_id"=>568492, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.t001", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Maternal_characteristics_and_pregnancy_outcomes_in_relation_to_preconceptional_folate_supplementation_in_34_480_singleton_pregnancies_/568492", "title"=>"Maternal characteristics and pregnancy outcomes in relation to preconceptional folate supplementation in 34,480 singleton pregnancies.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-05-12 02:21:32"}
  • {"files"=>["https://ndownloader.figshare.com/files/898132"], "description"=>"<p>HRs adjusted for maternal age, body mass index, race and ethnicity, educational level, marital status, smoking, parity, and history of prior preterm birth and preconceptional folate supplementation. Categorical variables: age, <35 (reference) versus ≥35 y; BMI <18.5 (reference), 18.5–25, 25–30, >30; married, not married (reference) versus married; education, ≤12 (reference) versus >12 y; smoking, nonsmoking (reference) versus smoking; nulliparous, nulliparous versus parous (reference); prior preterm birth, no prior preterm birth (reference) versus prior preterm birth. Proportional hazard assumption was met for each characteristic (proportional hazard test, <i>p</i>>0.05 for all).</p>a<p><i>n</i> = Number of spontaneous preterm births in each category in order as above or for dichotomous categories in order yes no.</p>", "links"=>[], "tags"=>["spontaneous", "preterm", "maternal", "characteristics"], "article_id"=>568578, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.t003", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_of_spontaneous_preterm_birth_in_relation_to_maternal_characteristics_n_34_480_/568578", "title"=>"Risk of spontaneous preterm birth in relation to maternal characteristics (<i>n</i> = 34,480).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-05-12 02:22:58"}
  • {"files"=>["https://ndownloader.figshare.com/files/897737"], "description"=>"<p>Folate = 0*, no preconceptional folate supplementation; Folate <1 yr*, preconceptional folate supplementation for less than a year; Folate > = 1 yr*, preconceptional folate supplementation for a year or longer. *Test for trend of survivor functions, <i>p</i> = 0.01.</p>", "links"=>[], "tags"=>["spontaneous", "preterm", "duration", "preconceptional", "folate"], "article_id"=>568175, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.g001", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Cumulative_risk_of_spontaneous_preterm_birth_in_relation_to_duration_of_preconceptional_folate_supplementation_/568175", "title"=>"Cumulative risk of spontaneous preterm birth in relation to duration of preconceptional folate supplementation.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-05-12 02:16:15"}
  • {"files"=>["https://ndownloader.figshare.com/files/897902"], "description"=>"<p>HRs and 95% CIs for spontaneous preterm birth in women with preconceptional folate supplementation for a year or longer (•) or less than a year (▪), compared to women without preconceptional folate supplementation – reference value (○), from Cox proportional hazard regression. *Wald test for equality of hazard ratios, testing the joint hypothesis that coefficients are equal to 0 and that they are equal to each other <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000061#pmed.1000061-StataCorp1\" target=\"_blank\">[66]</a>. SPTB, spontaneous preterm birth.</p>", "links"=>[], "tags"=>["spontaneous", "preterm", "duration", "preconceptional", "folate"], "article_id"=>568338, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.g003", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relative_risk_of_spontaneous_preterm_birth_in_relation_to_duration_of_preconceptional_folate_supplementation_/568338", "title"=>"Relative risk of spontaneous preterm birth in relation to duration of preconceptional folate supplementation.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-05-12 02:18:58"}
  • {"files"=>["https://ndownloader.figshare.com/files/898092"], "description"=>"<p>Incidence expressed per 1,000 women per week in a gestational age period (20–28, 28–32, or 32–37 wk). Risk estimates are calculated in comparison to the group without preconceptional folate supplementation. HR adjusted for maternal age, body mass index, race and ethnicity, educational level, marital status, smoking, parity and history of prior preterm birth and recruitment center. Number needed to treat (NNT) for folate supplementation ≥1 y is 435 women to prevent one case of spontaneous preterm birth between 20 and 28 wk, and 500 women to prevent one spontaneous preterm birth between 28 and 32 wk.</p>", "links"=>[], "tags"=>["spontaneous", "preterm", "preconceptional", "folate"], "article_id"=>568541, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.t002", "stats"=>{"downloads"=>1, "page_views"=>11, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_of_spontaneous_preterm_birth_and_preconceptional_folate_supplementation_/568541", "title"=>"Risk of spontaneous preterm birth and preconceptional folate supplementation.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-05-12 02:22:21"}
  • {"files"=>["https://ndownloader.figshare.com/files/897810"], "description"=>"<p>Proportion (mean ± standard error) of spontaneous preterm births before 32 wk in women with no preconceptional folate supplementation and supplementation for <1, 1–2, 3–4, 5–6, 7–11, and >12 mo.</p>", "links"=>[], "tags"=>["spontaneous", "preterm", "32", "wk", "duration", "preconceptional", "folate"], "article_id"=>568242, "categories"=>["Medicine", "Cell Biology"], "users"=>["Radek Bukowski", "Fergal D. Malone", "Flint T. Porter", "David A. Nyberg", "Christine H. Comstock", "Gary D. V. Hankins", "Keith Eddleman", "Susan J. Gross", "Lorraine Dugoff", "Sabrina D. Craigo", "Ilan E. Timor-Tritsch", "Stephen R. Carr", "Honor M. Wolfe", "Mary E. D'Alton"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000061.g002", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_of_spontaneous_preterm_birth_before_32_wk_in_relation_to_duration_of_preconceptional_folate_supplementation_/568242", "title"=>"Risk of spontaneous preterm birth before 32 wk in relation to duration of preconceptional folate supplementation.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-05-12 02:17:22"}

PMC Usage Stats | Further Information

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Relative Metric

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