Hsieh T.-T.Hsu J.-J.Cheng P.-J.CHIEN-NAN LEEJou H.-J.Chen C.-P.2021-02-042021-02-0420071028-4559https://www.scopus.com/inward/record.uri?eid=2-s2.0-35348863773&doi=10.1016%2fS1028-4559%2808%2960025-X&partnerID=40&md5=94a52d0b2b6faaac2a99effd6714ed4ehttps://scholars.lib.ntu.edu.tw/handle/123456789/547817Total hCG versus free β-hCG combined with alpha-fetoprotein for Down syndrome screening in Taiwanjournal article10.1016/S1028-4559(08)60025-X179621012-s2.0-35348863773