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Perfect Z2Z4-linear codes in Steganography [article]

H. Rifà-Pous, J. Rifà, L. Ronquillo
2010 arXiv   pre-print
in H.  ...  We group the remaining first α columns in H in such a way that, for any 2 ≤ i ≤ (α + 1)/2, the column vector h 2i is paired up with its complementary column vectorh 2i = h 2i+1 , whereh 2i = h 2i + 2.  ... 
arXiv:1002.0026v2 fatcat:dxe7c46gd5cznmzidbtvpw4igm

Product perfect codes and steganography

H. Rifà-Pous, J. Rifà
2009 Digital signal processing (Print)  
Proof: Recursively, take the parity check (t × 2 t − 1) matrix H t for the code of length 2 t − 1: H t =    0 · · · 0 1 · · · 1 1 H t−1 H t−1 0    , where we can begin the sequence with the parity  ...  ) where 0 ≤ D ≤ 1/2 and H is the entropy function.  ... 
doi:10.1016/j.dsp.2008.11.005 fatcat:24jo3di5w5hhpgt3oj76ov6ixq

Authentication of Composites in Different Structural Languages

Marzhan U. Suleybanova, Mаrifa M. Sultygova, Zulfira H. Kieva, Lyudmila M. Dudarova, Marziyat M. Bidanok
2020 Revista Amazonía investiga  
At first glance, the problem of distinguishing complex words from similar free syntactic combinations does not exist. But compound words are a reflection of "the diversity of linguistic activity." Therefore, one or more features sometimes is not enough to establish the identity of a compound word. And sometimes this is simply impossible, as some units correspond to all signs, while others do not. There are other units in the language, consisting of two or more words and outwardly similar to
more » ... lex words. Sometimes it is very difficult to distinguish complex words from outwardly similar syntactic combinations and phraseological units. It is natural that you need to draw a line between complex words and free combinations, because if we take all units of two or more words that designate one concept (with varying degrees of semantic integrity) as complex, we will make a huge confusion in definition of complex words and phrases.
doi:10.34069/ai/2020.26.02.46 fatcat:pojklos675e3pnluuo73gxwz6a

Breast-feeding and Overweight in Adolescence

Matthew W. Gillman, Sheryl L. Rifas-Shiman, Catherine S. Berkey, A Lindsay Frazier, Helaine R. H. Rockett, Carlos A. Camargo, Alison E. Field, Graham A. Colditz
2006 Epidemiology  
Background-Previous reports have found associations between having been breast-fed and a reduced risk of being overweight. These associations may be confounded by sociocultural determinants of both breast-feeding and obesity. We addressed this possibility by assessing the association of breast-feeding duration with adolescent obesity within sibling sets. Methods-We surveyed 5614 siblings age 9 to 14 years and their mothers. These children were a subset of participants in the Growing Up Today
more » ... dy, in which we had previously reported an inverse association of breast-feeding duration with overweight. We compared the prevalence of overweight (body mass index exceeding the age-sex-specific 85th percentile) in siblings who were breast-fed longer than the mean duration of their sibship with those who were breast-fed for a shorter period. Then we compared odds ratios from this within-family analysis with odds ratios from an overall (ie, not within-family) analysis. Results-Mean ± standard deviation breast-feeding duration was 6.4 ± 4.0 months, and crude prevalence of overweight was 19%. On average, siblings who were breast-fed longer than their family mean had breast-feeding duration 3.7 months longer than their shorter-duration siblings. The adjusted odds ratio (OR) for overweight among siblings with longer breast-feeding duration, compared with shorter duration, was 0.92 (95% confidence interval = 0.76-1.11). In overall analyses, the adjusted OR was 0.94 (0.88-1.00) for each 3.7-month increment in breast-feeding duration. Conclusion-The estimated OR for the within-family analysis was close to the overall estimate, suggesting that the apparent protective effect of breast-feeding on later obesity was not highly confounded by unmeasured sociocultural factors. A larger study of siblings, however, would be needed to confirm this conclusion. Breast-feeding promotion might be an effective way to blunt the worldwide epidemic of obesity. 1 Two recent metaanalyses show that having been breast-fed is associated with Correspondence: Matthew W. Gillman, DACP, HMS/HPHC,
doi:10.1097/01.ede.0000181629.59452.95 pmid:16357604 pmcid:PMC1994917 fatcat:iztmosdfqvdcjb5j7bcdagyjma

A mixture model to estimate SARS-CoV-2 seroprevalence in Chennai, India [article]

Matt D.T. Hitchings, Eshan U. Patel, Rifa Khan, Aylur K Srikrishnan, Mark Anderson, K. S. Kumar, Amy P. Wesolowski, Syed H. Iqbal, Mary A. Rodgers, Shruti H. Mehta, Gavin Cloherty, Derek A.T. Cummings (+1 others)
2022 medRxiv   pre-print
Specifically, a number h k drawn from a normal distribution with standard deviation α was added to the log-odds of seropositivity for each household, so that the probability of being seropositive p ik  ... 
doi:10.1101/2022.02.24.22271002 fatcat:4h2rovorwjdurc7myb7vixmmzq

Correlates of Participation in a Pediatric Primary Care–Based Obesity Prevention Intervention

Elsie M. Taveras, Katherine H. Hohman, Sarah N. Price, Sheryl L. Rifas-Shiman, Kathleen Mitchell, Steven L. Gortmaker, Matthew W. Gillman
2010 Obesity  
The purpose of this study was to examine correlates of participation in a childhood obesity prevention trial. We sampled parents of children recruited to participate in a randomized controlled trial. Eligible children were 2.0 -6.9 years with BMI ≥ 95 th percentile or 85 th -<95 th percentile if at least one parent was overweight. We attempted contact with parents of children who were potentially eligible. We recruited 475 parents via telephone following an introductory letter. We also
more » ... ed 329 parents who refused participation. Parents who refused participation (n=329) did not differ from those who participated (n=475) by number of children at home (OR 0.94 per child; 95% CI: 0.77, 1.15) or by child age (OR 1.07 per year; 95% CI: 0.95, 1.20) or sex (OR 1.06 for females v. males; 95% CI: 0.80, 1.41). After multivariate adjustment, parents who were college graduates v. < college graduates were less likely to participate (OR 0.62; 95% CI: 0.46, 0.83). In addition, parents were less likely (OR 0.41; 95% CI: 0.31, 0.56) to participate if their child was overweight v. obese. Among the 115 refusers with obese children, 21% cited as a reason for refusal that their children did not have a weight problem, v. 30% among the 214 refusers with overweight children. In conclusion, parents of preschool-age children with a BMI 85-95 th %ile are less likely to have their children participate in an obesity prevention trial than parents of children with BMI >95 th %ile. One reason appears to be they less frequently consider their children to have a weight problem.
doi:10.1038/oby.2010.207 pmid:20847735 pmcid:PMC3864039 fatcat:piipc2znizbq3cjppvukcww7bm

Can the Internet Be Used to Reach Parents for Family-Based Childhood Obesity Interventions?

Katherine H. Hohman, Sarah N. Price, Kendrin Sonneville, Sheryl L. Rifas-Shiman, Steven L. Gortmaker, Matthew W. Gillman, Elsie M. Taveras
2011 Clinical Pediatrics  
Objective-Identify socioeconomic correlates of computer/Internet use among parents of overweight preschool-aged children. Methods-Studied 470 baseline participants in a trial to prevent obesity in children 2-6.9 years with BMI ≥ 95th percentile or 85th-95th percentile with one overweight parent. Interviews with parents used Health Information National Trends Survey (HINTS) questions. Results/Conclusions-Ninety-four percent had home computers and 93% reported Internet usage. In adjusted models,
more » ... arents with ≤ college degree (OR 4.8 [95% CI 1.2, 18.3]) or with household income ≤ $50,000 (OR 7.6 [95% CI 2.2, 26.8]) had decreased likelihood of computer ownership. Of parents who reported going on-line, 63% used Internet to look for health/medical information for themselves and 42% for their children. Parents with ≤ a college degree or with BMI <25 kg/m 2 were less likely to use Internet. Results support using the Internet for early childhood obesity prevention with enhanced outreach efforts for low socioeconomic families.
doi:10.1177/0009922811423310 pmid:21997144 pmcid:PMC3840912 fatcat:bxjl64n5xjcftgdh3vm2wthuqm

Vitamin D status and hypertensive disorders in pregnancy

Heather H. Burris, Sheryl L. Rifas-Shiman, Susanna Y. Huh, Ken Kleinman, Augusto A. Litonjua, Emily Oken, Janet W. Rich-Edwards, Carlos A. Camargo, Matthew W. Gillman
2014 Annals of Epidemiology  
Purpose-Several studies have reported increased risk of preeclampsia when 25-hyrdoxyvitamin D (25[OH]D) levels are low. The extent to which 25(OH)D may lower risk for hypertensive disorder during pregnancy remains unclear. Methods-Among women enrolled in the Project Viva prenatal cohort in Massachusetts, we examined associations of 25(OH)D levels obtained at 16.4 -36.9 weeks of gestation (mean 27.9 weeks) with hypertensive disorders of pregnancy, including preeclampsia (56/1591, 3.5%) and
more » ... ional hypertension (109/1591, 6.9%). Results-We did not detect an association between plasma 25(OH)D concentration (mean 58, SD 22 nmol/L) and preeclampsia. For each 25 nmol/L increase in 25(OH)D, the adjusted odds ratio for preeclampsia was 1.14 (95% confidence interval: 0.77, 1.67). By contrast and contrary to hypothesis, higher 25(OH)D concentrations were associated with higher odds of gestational hypertension: adjusted odds ratio for gestational hypertension was 1.32 (95% confidence interval: 1.01, 1.72) per each 25nmol/L increment in 25(OH)D. Vitamin D intake patterns suggest this association was not because of reverse causation. While the elevated hypertension risk may be due to chance, randomized trials of vitamin D supplementation during pregnancy should monitor for gestational hypertension. Conclusions-These data do not support the hypothesis that higher 25(OH)D levels lower the overall risk of hypertensive disorders of pregnancy. MeSH headings Abbreviations 25(OH)D 25-hydroxyvitamin D BMI body mass index CI confidence interval OR odds ratio
doi:10.1016/j.annepidem.2014.02.001 pmid:24631523 pmcid:PMC4011985 fatcat:mm4asnoonvbgzlf2e55darhd6y

Prenatal and childhood exposure to per- and polyfluoroalkyl substances (PFASs) and child cognition

Maria H. Harris, Emily Oken, Sheryl L. Rifas-Shiman, Antonia M. Calafat, Xiaoyun Ye, David C. Bellinger, Thomas F. Webster, Roberta F. White, Sharon K. Sagiv
2018 Environment International  
Background-Perand polyfluoroalkyl substances (PFASs) are suspected developmental toxicants, but epidemiological evidence on neurodevelopmental effects of PFAS exposure is inconsistent. We examined associations of prenatal and childhood PFAS exposure with performance on assessments of cognition in children. Methods-We included mother-child pairs from Project Viva, a longitudinal Boston-area birth cohort enrolled during 1999-2002. We quantified concentrations of eight PFASs, including
more » ... ane sulfonate (PFOS), perfluorooctanoate (PFOA), and perfluorohexane sulfonate (PFHxS), in plasma collected from women during pregnancy (median 9.7 weeks gestation) and from children at a visit in mid-childhood (median age 7.7 years). In early childhood (median age 3.2 years) we administered standardized assessments of visual motor skills and vocabulary comprehension, and in mid-childhood we assessed visual motor skills, visual memory, and verbal and non-verbal intelligence. Using multivariable regression, we estimated associations of prenatal and childhood PFAS plasma concentrations with children's cognitive assessment scores, adjusted for relevant covariates including breastfeeding, maternal intelligence, parental education, and household income. Samples sizes ranged from 631-971, depending on analysis. Results-Prenatal PFAS concentrations were associated with both better and worse cognitive performance; children with top quartile prenatal concentrations of some PFASs had better visual motor abilities in early childhood and non-verbal IQ and visual memory in mid-childhood, while children with upper quartile prenatal PFOA and PFOS had lower mid-childhood visual-motor scores. In cross-sectional analyses of mid-childhood PFAS concentrations and cognitive assessments, visual-motor scores on the Wide Range Assessment of Visual Motor Abilities (WRAVMA) (standardized mean=100, standard deviation=15) were lower among children with higher PFHxS (fourth quartile (Q4) vs. Q1: −5.0, 95% confidence interval (CI): −9.1, −0.8). Upper quartiles of childhood PFOA and PFOS were also associated with somewhat lower childhood WRAVMA scores, but childhood PFASs were not associated with verbal or non-verbal IQ or visual memory. Conclusions-We present evidence suggesting associations of prenatal and childhood PFAS exposure with lower childhood visual motor abilities. Other results were inconsistent, with higher prenatal PFASs associated in some cases with better cognitive outcomes. Abbreviations ADHD attention deficit hyperactivity disorder CDC Centers for Disease Control and Prevention DAG Directed Acyclic Graph EtFOSAA 2-(N-ethyl-perfluorooctane sulfonamido) acetate FOSA perfluorooctane sulfonamide GFR glomerular filtration rate GM geometric mean Harris et al.
doi:10.1016/j.envint.2018.03.025 pmid:29705692 pmcid:PMC5970086 fatcat:slq6zpfrubdfzjyic4g7drlcb4

Vitamin D deficiency in pregnancy and gestational diabetes mellitus

Heather H. Burris, Sheryl L. Rifas-Shiman, Ken Kleinman, Augusto A. Litonjua, Susanna Y. Huh, Janet W. Rich-Edwards, Carlos A. Camargo, Matthew W. Gillman
2012 American Journal of Obstetrics and Gynecology  
Objective-We examined the association of second trimester maternal plasma 25hydroxyvitamin D (25[OH]D) during pregnancy with gestational diabetes mellitus(GDM). Study Design-Among 1314 pregnant women participating in Project Viva, a birth cohort study, we measured 25(OH)D levels at 26-28 weeks' gestation during GDM screening using a 1hour 50g glucose challenge test. Results-We found 25(OH)D levels <25nmol/L in 44/1087(4.0%) women with normal glucose tolerance, 9/159(5.7%) women with impaired
more » ... cose tolerance and 9/68(13.2%) women with GDM. Analyses adjusted for sociodemographics, season, maternal BMI, gestational weight gain and dietary factors, suggested that women with 25(OH)D levels <25 vs. ≥25 nmol/L may have higher odds of GDM (2.2 [0.8, 5.5]). Glucose levels after the glucose challenge test were inversely associated with 25(OH)D levels(P <0.01). Conclusion-Second trimester 25(OH)D levels were inversely associated with glucose levels after 1-hour 50g glucose challenge test and low 25(OH)D levels may be associated with increased risk of GDM.
doi:10.1016/j.ajog.2012.05.022 pmid:22717271 pmcid:PMC3432741 fatcat:frckkryuuranlafgp632pbv7zi

Sociodemographic and Perinatal Predictors of Early Pregnancy Per- and Polyfluoroalkyl Substance (PFAS) Concentrations

Sharon K. Sagiv, Sheryl L. Rifas-Shiman, Thomas F. Webster, Ana Maria Mora, Maria H. Harris, Antonia M. Calafat, Xiaoyun Ye, Matthew W. Gillman, Emily Oken
2015 Environmental Science and Technology  
Per-and polyfluoroalkyl substances (PFASs), used in food packaging and stain-resistant coatings, are suspected developmental toxicants that are ubiquitous and persistent in the environment. We measured plasma PFAS concentrations during early pregnancy (median = 9.7 weeks gestation) among 1645 women in the Boston-area Project Viva cohort, recruited during 1999-2002. We used multivariable linear regression to estimate associations of sociodemographic and perinatal predictors, including measures
more » ... pregnancy physiology (albumin, glomerular filtration rate (GFR)), with log-transformed plasma PFAS concentrations. Geometric mean concentrations for the four main PFASs, perfluorooctanesulfonate (PFOS), perfluorooctanoate (PFOA), perfluorohexanesulfonate (PFHxS) and perfluorononanoate (PFNA) were 25.4, 5.7, 2.5, and 0.6 ng/mL, respectively, comparable with general U.S. population concentrations during those years. Higher early pregnancy PFAS concentrations were associated with younger age (except PFNA), less educational attainment, nulliparity, no history of breastfeeding and higher prepregnancy body mass index in adjusted models. In addition, lower GFR was associated with 3-4% higher PFAS concentrations and higher albumin was associated with 4-6% higher PFAS concentrations. Our results show associations consistent (parity and breastfeeding) and less consistent (age and education) with previous studies. We also report associations with GFR and albumin, which were plasma PFAS concentrations during pregnancy. [16] [17] [18] [19] [20] [21] In three studies, lower PFAS concentrations were associated with higher parity and history of breastfeeding. 17, 18, 20 Previous studies also showed differences in PFAS concentrations for sociodemographic factors, including maternal age, race, and income, but patterns were not consistent across different studies or individual PFASs. 16, [19] [20] [21] Most previous studies of PFAS predictors have not examined measures of pregnancy physiology, which could confound associations of PFASs with developmental endpoints. 22,23 For example, maternal glomerular filtration rate (GFR), a measure of flow rate of filtered fluid through the kidney, has been shown to be associated with infant birth weight. 24 If GFR is also associated with PFAS concentrations, this could produce a spurious association between PFASs and birth weight. Better characterization of the relationship between maternal physiologic factors and PFAS concentrations would help determine whether these factors should be considered as potential confounders of associations of PFASs with child health outcomes. We examined sociodemographic and perinatal factors in relation to plasma concentrations of PFASs measured in early pregnancy in a large, well-characterized birth cohort of women who were pregnant during 1999-2002. We also considered markers of pregnancy physiology, including GFR and plasma albumin. Materials and Methods Study Population Pregnant women were enrolled in Project Viva 1999-2002 at their first prenatal visit at one of 8 obstetric clinics of Atrius Harvard Vanguard Medical Associates, a multispecialty group practice in eastern Massachusetts. 25 Eligible mothers were fluent in English, had singleton gestations, were <22 weeks gestation, and had no plans to move away from the study area. Of 2128 mothers with a live birth between November 1999 and February 2003, 1668 provided an early pregnancy blood sample. The Human Subjects Committees of participating institutions approved all study protocols and all participating mothers provided written informed consent. Plasma PFAS Measurement Plasma samples were stored in non-PFAS containing cryovial tubes in liquid nitrogen freezers. Of the 1668 early pregnancy samples (median = 9.7 weeks gestation; range = 4.8-21.4 weeks), 1645 had sufficient volume for PFAS measurements. Samples were thawed, aliquoted and sent to the Division of Laboratory Sciences at the CDC. Detailed analytic methods were described previously; 26 briefly, the CDC used online solid-phase extraction coupled with isotope dilution high-performance liquid chromatography-tandem mass spectrometry to report plasma concentrations for PFOA, PFOS, PFHxS, PFNA, 2-(N-ethylperfluorooctane sulfonamido) acetate (Et-PFOSA-AcOH), 2-(N-methyl-perfluorooctane sulfonamido) acetate (Me-PFOSA-AcOH), perfluorodecanoate (PFDeA) and perfluorooctane sulfonamide (PFOSA). The reported concentrations are for the sum of linear Sagiv et al.
doi:10.1021/acs.est.5b02489 pmid:26333069 pmcid:PMC4638415 fatcat:f7kxrhjpkfgmvjcckadtogx74e

Plasma 25-hydroxyvitamin D during pregnancy and small-for-gestational age in black and white infants

Heather H. Burris, Sheryl L. Rifas-Shiman, Carlos A. Camargo, Augusto A. Litonjua, Susanna Y. Huh, Janet W. Rich-Edwards, Matthew W. Gillman
2012 Annals of Epidemiology  
Purpose-In a prospective prenatal cohort study, we examined associations of second trimester and cord plasma 25-hydroxyvitamin D (25[OH]D) with small-for-gestational age (SGA), and the extent to which vitamin D might explain black/white differences in SGA. Methods-We studied 1067 white and 236 black mother-infant pairs recruited from 8 obstetrical offices early in pregnancy in Massachusetts. We analyzed 25(OH)D levels using an immunoassay and performed multivariable logistic models to estimate
more » ... he odds of SGA by category of 25(OH)D level. Results-Mean (standard deviation [SD]) second trimester 25(OH)D level was 60 nmol/L (21) and was lower for black (46 nmol/L [22]) than white (62 nmol/L [20]) women. 59 infants were SGA (4.5%) and more black than white infants were SGA (8.5% vs. 3.7%). The odds of SGA were higher with maternal 25(OH)D levels <25 vs. ≥25 nmol/L (adjusted odds ratio [OR] 3.17; 95% confidence interval [CI]:1.16, 8.63). The increased odds of SGA among black vs. white participants decreased from an OR of 2.04(1.04, 4.04) to 1.68(0.82, 3.46) after adjusting for 25(OH)D. Conclusions-Second trimester 25(OH)D levels <25 nmol/L were associated with higher odds of SGA. Our data raise the possibility that Vitamin D status may contribute to racial disparities in SGA. Abbreviations 25(OH)D 25-hydroxyvitamin D AGA appropriate-for-gestational age BMI body mass index CI confidence interval LGA large-for-gestational age OR odds ratio RIA radioimmunoassay SGA small-for-gestational age
doi:10.1016/j.annepidem.2012.04.015 pmid:22658824 pmcid:PMC3396717 fatcat:heyonnbb7jek5jluvi7dbwatgi

Human osteoblasts in vitro secrete tissue inhibitor of metalloproteinases and gelatinase but not interstitial collagenase as major cellular products

L Rifas, L R Halstead, W A Peck, L V Avioli, H G Welgus
1989 Journal of Clinical Investigation  
However, hOB spontaneously secreted large amounts of TIMP for at least 72 h in culture. hOB TIMP was found to be identical to human fibroblast TIMP by double immunodiffusion, metabolic labeling and immunoprecipitation  ...  Abbreviations used in this paper: BGP, bone Gla protein; EGF, epidermal growth factor; hOB, human osteoblast cultures; rhIL-lI, recombinant human interleukin I#; TIMP, tissue inhibitor of metalloproteinases. 686 Rifas  ...  Cells were incubated for 24-72 h in either 10% FBS-containing or serum-free medium.  ... 
doi:10.1172/jci114216 pmid:2547836 pmcid:PMC548933 fatcat:s6aqkopekrcsxoh3n6xjkj4ecq

Associations of long interspersed nuclear element-1 DNA methylation with preterm birth in a prospective cohort study

H. H. Burris, S. L. Rifas-Shiman, A. Baccarelli, L. Tarantini, C. E. Boeke, K. Kleinman, A. A. Litonjua, J. W. Rich-Edwards, M. W. Gillman
2012 Journal of Developmental Origins of Health and Disease  
Preterm birth affects over 12% of all infants born in the US yet the biology of early delivery remains unclear, including whether epigenetic mechanisms are involved. We examined associations of maternal and umbilical cord blood long interspersed nuclear element-1 (LINE-1) DNA methylation with length of gestation and odds of preterm birth in singleton pregnancies in Project Viva. In white blood cells from maternal blood during 1 st trimester (n=914) and 2 nd trimester (n=922), and from venous
more » ... d blood at delivery (n=557), we measured LINE-1 by pyrosequencing (expressed as %5 methyl cytosines within the LINE-1 region analyzed [%5mC]). We ran linear regression models to analyze differences in gestation length, and logistic models for odds of preterm birth (<37 v. ≥37 weeks gestation), across quartiles of LINE-1. Mean(SD) LINE-1 levels were 84.3(0.6), 84.5(0.4), and 84.6(0.7) %5mC for 1 st trimester, 2 nd trimester and cord blood, respectively. Mean(SD) gestational age was 39.5(1.8) weeks, and 6.5% of infants were born preterm. After adjustment for maternal age, race/ethnicity, BMI, education, smoking status, and fetal sex, women with the highest vs. lowest quartile of 1 st trimester LINE-1 had longer gestations (0.45 weeks [95% CI 0.12, 0.78]) and lower odds of preterm birth (OR 0.40 [0.17, 0.94]), whereas associations with cord blood LINE-1 were in the opposite direction (−0.45 weeks, −0.83, −0.08) and (OR 4.55 [1.18, 17.5]). In conclusion, higher early pregnancy LINE-1 predicts lower risk of preterm birth. In contrast, preterm birth is associated with lower LINE-1 in cord blood. Statement of Interest None NIH Public Access
doi:10.1017/s2040174412000104 pmid:22720130 pmcid:PMC3377352 fatcat:4uqluvqvh5aqjhjr3celtfybfm

Birth weight-for-gestational age is associated with DNA methylation at birth and in childhood

Golareh Agha, Hanine Hajj, Sheryl L. Rifas-Shiman, Allan C. Just, Marie-France Hivert, Heather H. Burris, Xihong Lin, Augusto A. Litonjua, Emily Oken, Dawn L. DeMeo, Matthew W. Gillman, Andrea A. Baccarelli
2016 Clinical Epigenetics  
Trained medical personnel obtained venous umbilical cord blood samples immediately after delivery, which they promptly stored in a dedicated refrigerator (4°C) and transported for processing within 24 h,  ... 
doi:10.1186/s13148-016-0285-3 pmid:27891191 pmcid:PMC5112715 fatcat:5n5f5iwfkbdwtf3ipgc47ssbme
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