{"identifier":"nobleid:/w1/20260526/6A61FF60","arkIdentifier":"ark:/48914/w1/20260526/6A61FF60","version":1,"workTitle":"First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics.","workType":"Journal Article","authors":"Kagan KO, Wright D, Spencer K, Molina FS, Nicolaides KH","description":null,"workUrl":null,"createdAt":"2026-05-26T04:28:14.902321Z","canonicalUrl":"https://nobleid.org/ark:/48914/w1/20260526/6A61FF60.v1"}