@article{35c5b823c32d4f918072305d0371f356,
title = "Prospective study evaluating performance of first-trimester combined screening for trisomy 21 using repeat sampling of maternal serum markers PAPP-A and free β-hCG",
abstract = "To prospectively evaluate the performance of first-trimester combined screening for trisomy 21 using the biochemical markers pregnancy-associated plasma protein-A (PAPP-A) and free beta-human chorionic gonadotropin (free β-hCG) obtained before and at the time of the nuchal translucency (NT) scan.",
author = "C Ekelund and D Wright and S Ball and I Kirkegaard and P N{\o}rgaard and S S{\o}rensen and L Friis-Hansen and J{\o}rgensen, {F S} and Niels T{\o}rring and Bech, {B H} and Petersen, {O B} and A Tabor",
note = "Copyright {\textcopyright} 2012 ISUOG. Published by John Wiley & Sons, Ltd.",
year = "2012",
doi = "10.1002/uog.12266",
language = "English",
volume = "40",
pages = "276--81",
journal = "Ultrasound in Obstetrics and Gynecology",
issn = "0960-7692",
publisher = "John/Wiley & Sons Ltd",
number = "3",
}