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Duman","year":"2018","journal-title":"J Matern Neonatal Med"},{"key":"pone.0239630.ref091","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1007\/s00404-009-1272-0","article-title":"Effect of umbilical vein blood flow on perinatal outcome of fetuses with lean and\/or hypo-coiled umbilical cord","volume":"283","author":"MM El Behery","year":"2011","journal-title":"Arch Gynecol Obstet"},{"key":"pone.0239630.ref092","doi-asserted-by":"crossref","first-page":"44","DOI":"10.1016\/j.ijgo.2006.05.030","article-title":"Perinatal mortality following umbilical cord prolapse","volume":"95","author":"CA Enakpene","year":"2006","journal-title":"Int J Gynaecol Obstet"},{"key":"pone.0239630.ref093","doi-asserted-by":"crossref","first-page":"254","DOI":"10.1111\/j.1742-1241.1996.tb09545.x","article-title":"Umbilical coiling index: is it a marker for the foetus at risk?","volume":"50","author":"T Ercal","year":"1996","journal-title":"Br J Clin 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Georgiadis","year":"2014","journal-title":"Placenta"},{"key":"pone.0239630.ref100","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1046\/j.0960-7692.2001.00507.x","article-title":"First-trimester sonographic umbilical cord diameter and the growth of the human embryo","volume":"18","author":"F Ghezzi","year":"2001","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0239630.ref101","doi-asserted-by":"crossref","first-page":"1705","DOI":"10.1111\/1471-0528.12890","article-title":"Umbilical cord prolapse\u2014changing patterns and improved outcomes: a retrospective cohort study","volume":"121","author":"C Gibbons","year":"2014","journal-title":"BJOG An Int J Obstet Gynaecol"},{"key":"pone.0239630.ref102","article-title":"Impact of Nuchal Cord on Intrapartum Complications, Mode of Delivery and Perinatal Outcome","volume":"7","author":"A Gupta","year":"2018","journal-title":"J Evol Med Dent Sci"},{"key":"pone.0239630.ref103","doi-asserted-by":"crossref","first-page":"91","DOI":"10.5114\/aoms.2013.33068","article-title":"Diagnosis of true umbilical cord knot","volume":"10","author":"W Guzikowski","year":"2014","journal-title":"Arch Med Sci"},{"key":"pone.0239630.ref104","doi-asserted-by":"crossref","first-page":"471","DOI":"10.1046\/j.1469-0705.2002.00670.x","article-title":"Comparison of three-dimensional, two-dimensional and color Doppler ultrasound in predicting the presence of a nuchal cord at birth","volume":"19","author":"U Hanaoka","year":"2002","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0239630.ref105","doi-asserted-by":"crossref","first-page":"406","DOI":"10.1016\/S1071-5576(03)00139-4","article-title":"The effect of nuchal cord on amniotic fluid and cord blood erythropoietin at delivery","volume":"10","author":"K Hashimoto","year":"2003","journal-title":"J Soc Gynecol 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Jaya","year":"1995","journal-title":"Indian Pediatr"},{"key":"pone.0239630.ref110","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1007\/s00428-013-1513-2","article-title":"Umbilical cord coiling: clinical outcomes in an unselected population and systematic review","volume":"464","author":"FA Jessop","year":"2014","journal-title":"Virchows Arch"},{"key":"pone.0239630.ref111","doi-asserted-by":"crossref","first-page":"15","DOI":"10.4103\/2321-8568.199535","article-title":"Incidence of Cord around the Neck and Its Effects on Labour and Neonatal Outcome","volume":"7","author":"K Joshi","year":"2017","journal-title":"Adv Hum Biol"},{"key":"pone.0239630.ref112","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/S0020-7292(03)00333-3","article-title":"Umbilical cord prolapse and perinatal outcomes","volume":"84","author":"B Kahana","year":"2004","journal-title":"Int J Gynaecol Obstet"},{"key":"pone.0239630.ref113","author":"M Namli Kalem","journal-title":"The Journal of Maternal-Fetal & Neonatal Medicine Investigation of possible maternal and fetal factors which affect umbilical coiling index"},{"key":"pone.0239630.ref114","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1016\/j.ijgo.2006.05.029","article-title":"The umbilical coiling index and adverse perinatal outcome","volume":"95","author":"M Kashanian","year":"2006","journal-title":"Int J Gynecol Obstet"},{"key":"pone.0239630.ref115","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1016\/j.ejogrb.2018.10.037","article-title":"Prenatal measurement of umbilical cord length using magnetic resonance imaging","volume":"231","author":"D Katsura","year":"2018","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"pone.0239630.ref116","doi-asserted-by":"crossref","first-page":"434","DOI":"10.1080\/14767058.2016.1174993","article-title":"Impact of a prenatally diagnosed nuchal cord on obstetrical outcome in an unselected population","volume":"30","author":"A Kesrouani","year":"2017","journal-title":"J Matern Fetal Neonatal Med"},{"key":"pone.0239630.ref117","doi-asserted-by":"crossref","first-page":"342065","DOI":"10.1155\/2015\/342065","article-title":"Effect of Umbilical Cord Entanglement and Position on Pregnancy Outcomes","volume":"2015","author":"N Kobayashi","year":"2015","journal-title":"Obstet Gynecol Int"},{"key":"pone.0239630.ref118","first-page":"143","article-title":"Impact of nuchal cord on fetal outcomes, mode of delivery, and management: a questionnaire survey of pregnant women","volume":"21","author":"CW Kong","year":"2015","journal-title":"Hong Kong Med J = Xianggang yi xue za zhi"},{"key":"pone.0239630.ref119","first-page":"217","article-title":"Minimum cord length that allows spontaneous vaginal delivery","volume":"53","author":"GE LaMonica","year":"2008","journal-title":"J Reprod 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Malpas","year":"1964","journal-title":"Br Med J"},{"key":"pone.0239630.ref126","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1016\/j.tjog.2018.09.001","article-title":"Multiple part umbilical cord entanglement and neonatal outcomes","volume":"57","author":"T Mariya","year":"2018","journal-title":"Taiwan J Obstet Gynecol"},{"key":"pone.0239630.ref127","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1055\/s-2005-837737","article-title":"Effects of nuchal cord on birthweight and immediate neonatal outcomes","volume":"22","author":"JM Mastrobattista","year":"2005","journal-title":"Am J Perinatol"},{"key":"pone.0239630.ref128","first-page":"3","article-title":"Nuchal cord between 37 and 42 completed weeks of gestation\u2014diagnosis and prognostic value","volume":"46","author":"D Markov","year":"2007","journal-title":"Akush Ginekol (Sofiia)"},{"key":"pone.0239630.ref129","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1111\/j.1479-828X.1988.tb01637.x","article-title":"Umbilical cord knots and encirclements","volume":"28","author":"H McLennan","year":"1988","journal-title":"Aust N Z J Obstet Gynaecol"},{"key":"pone.0239630.ref130","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1016\/S0022-3476(85)80149-9","article-title":"Umbilical cord length: clinical significance","volume":"107","author":"RL Naeye","year":"1985","journal-title":"J Pediatr"},{"key":"pone.0239630.ref131","doi-asserted-by":"crossref","first-page":"487","DOI":"10.1016\/j.tjog.2018.04.033","article-title":"Antenatal umbilical coiling index in gestational diabetes mellitus and non-gestational diabetes pregnancy","volume":"57","author":"L Najafi","year":"2018","journal-title":"Taiwan J Obstet Gynecol"},{"key":"pone.0239630.ref132","first-page":"21","article-title":"Antenatal umbilical coiling index and newborn outcomes: cohort study","volume":"7","author":"JM Ndolo","year":"2017","journal-title":"NcbiNlmNihGov"},{"key":"pone.0239630.ref133","first-page":"33","article-title":"Length of human umbilical cord in african population","volume":"83","author":"S. Nnatu","year":"1960","journal-title":"J Natl Med Assoc"},{"key":"pone.0239630.ref134","doi-asserted-by":"crossref","first-page":"810","DOI":"10.1080\/00016340500345428","article-title":"Obstetrical factors related to nuchal cord","volume":"85","author":"O Ogueh","year":"2006","journal-title":"Acta Obstet Gynecol Scand"},{"key":"pone.0239630.ref135","doi-asserted-by":"crossref","first-page":"1457","DOI":"10.1111\/jog.13092","article-title":"Perinatal outcomes of abnormal umbilical coiling according to a modified umbilical coiling index","volume":"42","author":"Y Ohno","year":"2016","journal-title":"J Obstet Gynaecol Res"},{"key":"pone.0239630.ref136","doi-asserted-by":"crossref","first-page":"251","DOI":"10.3233\/NPM-15915056","article-title":"Clinical associations to abnormal umbilical cord length in Latin American newborns","volume":"8","author":"M Olaya-C","year":"2015","journal-title":"J Neonatal Perinatal 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R\u00e4is\u00e4nen","year":"2013","journal-title":"Int J Gynecol Obstet"},{"key":"pone.0239630.ref144","doi-asserted-by":"crossref","first-page":"573","DOI":"10.1016\/0029-7844(94)00435-G","article-title":"Adverse perinatal outcome in patients with an abnormal umbilical coiling index","volume":"85","author":"J Rana","year":"1995","journal-title":"Obstet Gynecol"},{"key":"pone.0239630.ref145","first-page":"450","article-title":"Umbilical cord length and intrapartum complications","volume":"57","author":"WF Rayburn","year":"1981","journal-title":"Obstet Gynecol"},{"key":"pone.0239630.ref146","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1034\/j.1600-0412.2003.820106.x","article-title":"Relationship between umbilical cord morphology and nuchal cord entanglement","volume":"82","author":"MS Rogers","year":"2003","journal-title":"Acta Obstet Gynecol Scand"},{"key":"pone.0239630.ref147","first-page":"401","article-title":"Color Doppler flowmetry values in fetuses with nuchal cord encirclement","volume":"68","author":"G Romero Guti\u00e9rrez","year":"2000","journal-title":"Ginecol Obstet Mex"},{"key":"pone.0239630.ref148","first-page":"92","article-title":"Evaluation of umbilical coiling index as a predictor of pregnancy outcome","volume":"5","author":"K Sahoo","year":"2015","journal-title":"IJHSR"},{"key":"pone.0239630.ref149","article-title":"Associa\u00e7\u00e3o entre as caracter\u00edsticas macrosc\u00f3picas do cord\u00e3o umbilical, gesta\u00e7\u00e3o de alto risco e repercuss\u00f5es neonatais","volume":"51","author":"AKM Salge","year":"2018","journal-title":"Rev da Esc Enferm da USP"},{"key":"pone.0239630.ref150","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1097\/01.AOG.0000165322.42051.0f","article-title":"Nuchal cords in term and postterm deliveries\u2014Do we need to know?","volume":"106","author":"L Sch\u00e4ffer","year":"2005","journal-title":"Obstet Gynecol"},{"key":"pone.0239630.ref151","doi-asserted-by":"crossref","first-page":"650","DOI":"10.1007\/s13224-012-0230-0","article-title":"Association of Umbilical Coiling Index by Colour Doppler Ultrasonography at 18\u201322 Weeks of Gestation and Perinatal Outcome","volume":"62","author":"B Sharma","year":"2012","journal-title":"J Obstet Gynecol India"},{"key":"pone.0239630.ref152","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1007\/s00404-005-0110-2","article-title":"Nuchal cord is not associated with adverse perinatal outcome","volume":"274","author":"E Sheiner","year":"2006","journal-title":"Arch Gynecol Obstet"},{"key":"pone.0239630.ref153","doi-asserted-by":"crossref","first-page":"3770","DOI":"10.18203\/2320-1770.ijrcog20173622","article-title":"Study of length of umbilical cord and fetal outcome: a study of 1000 deliveries","volume":"6","author":"H. Shiva Kumar","year":"2017","journal-title":"Int J Reprod Contraception, Obstet Gynecol."},{"key":"pone.0239630.ref154","first-page":"360","article-title":"Nuchal cord and perinatal outcome","volume":"5","author":"NS Shrestha","year":"2007","journal-title":"Kathmandu Univ Med J (KUMJ)"},{"key":"pone.0239630.ref155","first-page":"213","article-title":"Cord round the neck. An evaluation of its significance","volume":"6","author":"TA Sinnathuray","year":"1965","journal-title":"Singapore Med J"},{"key":"pone.0239630.ref156","doi-asserted-by":"crossref","first-page":"439","DOI":"10.3109\/00016348909021017","article-title":"Uterine size, parity and umbilical cord length","volume":"68","author":"T S\u00f8rnes","year":"1989","journal-title":"Acta Obstet Gynecol Scand"},{"key":"pone.0239630.ref157","doi-asserted-by":"crossref","first-page":"725","DOI":"10.1016\/0029-7844(95)00258-S","article-title":"Umbilical cord encirclements and fetal growth restriction","volume":"86","author":"T. 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Stanek","year":"2016","journal-title":"Virchows Arch"},{"key":"pone.0239630.ref160","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1016\/S0301-2115(02)00307-X","article-title":"Umbilical cord length and parity\u2014the Greek experience","volume":"107","author":"T Stefos","year":"2003","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"pone.0239630.ref161","doi-asserted-by":"crossref","first-page":"359","DOI":"10.3109\/14767059609018415","article-title":"Umbilical vascular coiling and nuchal entanglement","volume":"5","author":"TH Strong","year":"1996","journal-title":"J Matern Neonatal Med"},{"key":"pone.0239630.ref162","doi-asserted-by":"crossref","first-page":"745","DOI":"10.1515\/jpm.2011.096","article-title":"Influence of umbilical cord abnormalities (velamentous\/marginal cord insertion and nuchal cord) on the perinatal outcomes of the second twin after vaginal delivery of the first twin","volume":"39","author":"S Suzuki","year":"2011","journal-title":"J Perinat Med"},{"key":"pone.0239630.ref163","first-page":"40","article-title":"Incidence of nuchal cord, mode of delivery and perinatal outcome: A notable experience in Dhulikel Hospital\u2014Kathmandu University Hospital","volume":"15","author":"S. 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