{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T22:26:16Z","timestamp":1777587976051,"version":"3.51.4"},"reference-count":37,"publisher":"Public Library of Science (PLoS)","issue":"12","license":[{"start":{"date-parts":[[2019,12,6]],"date-time":"2019-12-06T00:00:00Z","timestamp":1575590400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"DOI":"10.1371\/journal.pone.0226090","type":"journal-article","created":{"date-parts":[[2019,12,6]],"date-time":"2019-12-06T18:29:34Z","timestamp":1575656974000},"page":"e0226090","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":13,"title":["Longitudinal Doppler references for monochorionic twins and comparison with singletons"],"prefix":"10.1371","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8856-442X","authenticated-orcid":true,"given":"Daniela","family":"Casati","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcella","family":"Pellegrino","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivan","family":"Cortinovis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7042-797X","authenticated-orcid":true,"given":"Elena","family":"Spada","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mariano","family":"Lanna","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefano","family":"Faiola","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irene","family":"Cetin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Angela","family":"Rustico","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2019,12,6]]},"reference":[{"issue":"6","key":"pone.0226090.ref001","doi-asserted-by":"crossref","DOI":"10.1002\/14651858.CD007529.pub4","article-title":"Fetal and umbilical Doppler ultrasound in high-risk pregnancies","author":"Z Alfirevic","year":"2017","journal-title":"Cochrane Database of Systematic Reviews"},{"issue":"2S","key":"pone.0226090.ref002","first-page":"S783","article-title":"Outcome in early-onset fetal growth restriction is best combining computerized fetal heart rate analysis with ductus venosus Doppler: insights from the Trial of Umbilical and Fetal Flow in Europe","volume":"218","author":"TRUFFLE Investigators","year":"2018","journal-title":"Am J Obstet Gynecol"},{"issue":"2","key":"pone.0226090.ref003","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1002\/uog.12371","article-title":"ISUOG practice guidelines: use of Doppler ultrasonography in obstetrics","volume":"41","author":"A Bhide","year":"2013","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref004","article-title":"Reference ranges for Doppler indices of umbilical and middle cerebral arteries and cerebroplacental ratio: a systematic review","author":"D Oros","year":"2018","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"3","key":"pone.0226090.ref005","doi-asserted-by":"crossref","first-page":"937","DOI":"10.1016\/j.ajog.2004.09.019","article-title":"Reference ranges for serial measurements of umbilical artery Doppler indices in the second half of pregnancy","volume":"192","author":"G Acharya","year":"2005","journal-title":"Am J Obstet Gynecol"},{"issue":"3","key":"pone.0226090.ref006","doi-asserted-by":"crossref","first-page":"287","DOI":"10.1002\/uog.4088","article-title":"Middle cerebral artery blood flow velocities and pulsatility index and the cerebroplacental pulsatility ratio: longitudinal reference ranges and terms for serial measurements","volume":"30","author":"C Ebbing","year":"2007","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"7","key":"pone.0226090.ref007","first-page":"890","article-title":"Longitudinal reference ranges for ductus venosus flow velocities and waveform indices. Ultrasound Obstet Gynecol","volume":"28","author":"J Kessler","year":"2006","journal-title":"Dec"},{"issue":"4","key":"pone.0226090.ref008","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1002\/uog.1882","article-title":"Middle cerebral artery peak systolic velocity for the diagnosis of fetal anemia: the untold story","volume":"25","author":"G. Mari","year":"2005","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref009","article-title":"Fetal Medicine Foundation reference ranges for umbilical artery and middle cerebral artery pulsatility index and cerebroplacental ratio","author":"A Ciobanu","year":"2018","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref010","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1053\/j.semperi.2008.04.011","article-title":"Antenatal fetal assessment: multifetal gestation\u2013an overview","volume":"32","author":"LD Devoe","year":"2008","journal-title":"Semin Perinatol"},{"issue":"5","key":"pone.0226090.ref011","first-page":"514.e1","article-title":"Societ\u00e0 Italiana di Ecografia Ostetrica e Ginecologica Working Group on Fetal Biometric Charts. Development of customized fetal growth charts in twins","volume":"216","author":"T Ghi","year":"2017","journal-title":"Am J Obstet Gynecol"},{"issue":"4","key":"pone.0226090.ref012","doi-asserted-by":"crossref","first-page":"461","DOI":"10.1002\/uog.13302","article-title":"Umbilical and fetal middle cerebral artery Doppler reference ranges in a twin population followed longitudinally from 24 to 38 weeks' gestation","volume":"44","author":"C Mulcahy","year":"2014","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref013","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1111\/j.1471-0528.2007.01556.x","article-title":"Increased perinatal mortality and morbidity in monochorionic versus dichorionic twin pregnancies: clinical implications of a large Dutch cohort study","volume":"115","author":"KE Hack","year":"2008","journal-title":"BJOG"},{"key":"pone.0226090.ref014","doi-asserted-by":"crossref","first-page":"514.e1","DOI":"10.1016\/j.ajog.2008.03.050","article-title":"The outcome of monochorionic diamniotic twin gestations in the era of invasive fetal therapy: a prospective cohort study","volume":"199","author":"L Lewi","year":"2008","journal-title":"Am J Obstet Gynecol"},{"key":"pone.0226090.ref015","article-title":"The vascular anastomoses in monochorionic twin pregnancies and their clinical consequences","author":"L Lewi","year":"2013b","journal-title":"AJOG Expert Reviews"},{"issue":"10","key":"pone.0226090.ref016","doi-asserted-by":"crossref","first-page":"1362","DOI":"10.1111\/1471-0528.13326","article-title":"Danish Fetal Medicine Study Group Perinatal outcome after first-trimester risk assessment in monochorionic and dichorionic twin pregnancies: a population-based register study","volume":"122","author":"MK Kristiansen","year":"2015","journal-title":"BJOG"},{"key":"pone.0226090.ref017","article-title":"Single fetal demise in monochorionic pregnancies: incidence and patterns of cerebral injury","author":"JM van Klink","year":"2014","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"6","key":"pone.0226090.ref018","doi-asserted-by":"crossref","first-page":"546","DOI":"10.1017\/thg.2018.58","article-title":"Major Discordant Structural Anomalies in Monochorionic Twins: Spectrum and Outcomes","volume":"21","author":"MA Rustico","year":"2018","journal-title":"Twin Res Hum Genet"},{"key":"pone.0226090.ref019","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1046\/j.1469-0705.1995.06050307.x","article-title":"Design and analysis of longitudinal studies of fetal size","volume":"6","author":"P Royston","year":"1995","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref020","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1046\/j.1469-0705.1998.11010030.x","article-title":"How to construct \u2018normal ranges\u2019 for fetal variables","volume":"11","author":"P Royston","year":"1998","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref021","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1002\/uog.6436","article-title":"Reference ranges for middle cerebral artery peak systolic velocity in monochorionic diamniotic twins: a longitudinal study","volume":"34","author":"P Klaritsch","year":"2009","journal-title":"Ultrasound Obstet Gynecol"},{"key":"pone.0226090.ref022","first-page":"353","article-title":"Neonatal Anthropometric Charts: The Italian neonatal study compared with other European studies","volume":"51","author":"E Bertino","year":"2010","journal-title":"JPGN"},{"key":"pone.0226090.ref023","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1002\/uog.15821","article-title":"ISUOG Practice Guidelines: role of ultrasound in twin pregnancy","volume":"47","author":"A Khalil","year":"2016","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"6","key":"pone.0226090.ref024","first-page":"917","article-title":"Standards of birth weight in twin gestations stratified by placental chorionicity. Obstet Gynecol","volume":"91","author":"CV Ananth","year":"1998"},{"issue":"43","key":"pone.0226090.ref025","doi-asserted-by":"crossref","first-page":"429","DOI":"10.2307\/2986270","article-title":"Using Fractional Polynomials of Continuous Covariates: Parsimonious Parametric Modelling","volume":"43","author":"P Royston","year":"1994","journal-title":"Appl. Statist"},{"key":"pone.0226090.ref026","doi-asserted-by":"crossref","first-page":"917","DOI":"10.1002\/sim.4780121003","article-title":"Construction of age-related reference centiles using absolute residuals","volume":"12","author":"DG Altman","year":"1993","journal-title":"Statistics in Medicine"},{"key":"pone.0226090.ref027","unstructured":"SAS\/STAT\u00ae 9.22 User\u2019s Guide. The QUANTREG Procedure (Book Excerpt). SAS Institute Inc. 2010. SAS\/STAT\u00ae 9.22 User\u2019s Guide. Cary, NC: SAS Institute Inc."},{"key":"pone.0226090.ref028","volume-title":"Using PROC MIXED in Hierarchical Linear Models: Examples from two- and three- level school-effect analysis, and meta-analysis research","author":"S. Suzuki"},{"key":"pone.0226090.ref029","unstructured":"Bell BA., Ene M., Smiley W., Schoeneberger JA. A Multilevel Model Primer Using SAS\u00ae PROC MIXED. SAS Global Forum 2013. Statistics and Data Analysis; Paper 433\u20132013."},{"issue":"8","key":"pone.0226090.ref030","doi-asserted-by":"crossref","first-page":"550","DOI":"10.1038\/sj.jp.7200292","article-title":"Staging of twin-twin transfusion syndrome","volume":"19","author":"RA Quintero","year":"1999","journal-title":"J Perinatol"},{"key":"pone.0226090.ref031","doi-asserted-by":"crossref","first-page":"456","DOI":"10.1002\/uog.1013","article-title":"Incidence and characteristics of umbilical artery intermittent absent and\/or reversed end-diastolic flow in complicated and uncomplicated monochorionic twin pregnancies","volume":"23","author":"E Gratac\u00f3s","year":"2004","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"4","key":"pone.0226090.ref032","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1159\/000304512","article-title":"Twin anemia-polycythemia sequence: diagnostic criteria, classification, perinatal management and outcome","volume":"27","author":"F Slaghekke","year":"2010","journal-title":"Fetal Diagn Ther"},{"issue":"2","key":"pone.0226090.ref033","doi-asserted-by":"crossref","first-page":"195","DOI":"10.7863\/jum.2007.26.2.195","article-title":"Middle cerebral artery peak systolic velocity in monochorionic and dichorionic twin pregnancies","volume":"26","author":"JS Dashe","year":"2007","journal-title":"J Ultrasound Med"},{"key":"pone.0226090.ref034","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1046\/j.1469-0705.2002.00634.x","article-title":"Cerebral hemodynamics and fetal behavioural states","volume":"19","author":"G. Clerici","year":"2002","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"6","key":"pone.0226090.ref035","doi-asserted-by":"crossref","first-page":"788","DOI":"10.1002\/uog.20096","article-title":"Improved prediction of twin anemia-polycythemia sequence by delta middle cerebral artery peak systolic velocity: new antenatal classification system","volume":"53","author":"LSA Tollenaar","year":"2019","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"3","key":"pone.0226090.ref036","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1002\/uog.14640","article-title":"Fetal growth reference ranges in twin pregnancy: analysis of the Southwest Thames Obstetric Research Collaborative (STORK) multiple pregnancy cohort","volume":"45","author":"Southwest Thames Obstetric Research Collaborative (STORK)","year":"2015","journal-title":"Ultrasound Obstet Gynecol"},{"issue":"5","key":"pone.0226090.ref037","first-page":"514.e1","article-title":"Societ\u00e0 Italiana di Ecografia Ostetrica e Ginecologica Working Group on Fetal Biometric Charts. Development of customized fetal growth charts in twins","volume":"216","author":"T Ghi","year":"2017","journal-title":"Am J Obstet Gynecol"}],"container-title":["PLOS ONE"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0226090","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,10,7]],"date-time":"2022-10-07T22:09:09Z","timestamp":1665180549000},"score":1,"resource":{"primary":{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0226090"}},"subtitle":[],"editor":[{"given":"Iuri","family":"Corsini","sequence":"first","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]}],"short-title":[],"issued":{"date-parts":[[2019,12,6]]},"references-count":37,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2019,12,6]]}},"URL":"https:\/\/doi.org\/10.1371\/journal.pone.0226090","relation":{},"ISSN":["1932-6203"],"issn-type":[{"value":"1932-6203","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,12,6]]}}}