We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleFirst-trimester screening for trisomy 21 in Denmark: implications for detection and birth rates of trisomy 18 and trisomy 13.AuthorsEkelund CK; Petersen OB; Skibsted L; Kjaergaard S; Vogel I; Tabor APublicationUltrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2011, Vol 38, Issue 2, p140ISSN1469-0705Publication typearticleDOI10.1002/uog.8929