@article{bf4d514a79d64e3691a0bac84c6dbcf2,
title = "OC04.04: Screen-positive for Trisomy 21 at combined first trimester screening: how many do not have a prenatal karyotype?",
author = "Petersen, {Olav Bj{\o}rn} and J Hyett and Ekelund, {Charlotte K} and Ann Tabor",
year = "2014",
month = sep,
doi = "10.1002/uog.13485",
language = "English",
volume = "44",
pages = "9--9",
journal = "Ultrasound in Obstetrics & Gynecology",
issn = "0960-7692",
publisher = "John/Wiley & Sons Ltd",
number = "S1",
note = "ISUOG 2014 ; Conference date: 13-09-2014 Through 17-09-2014",
}