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OP23.05: Increased time‐to‐pregnancy in spontaneously conceived pregnancies is associated with decreased levels of PAPP‐A and free β‐hCG in first‐trimester screening for Down syndrome
Author(s) -
Kirkegaard I.,
Tabor A.,
Henriksen T. B.,
Uldbjerg N.
Publication year - 2012
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1002/uog.11610
Subject(s) - medicine , obstetrics , gynecology , pregnancy , in vitro fertilisation , reproductive medicine , biology , genetics