| D A Krantz Association of extreme first-trimester free human chorionic gonadotropin-beta, pregnancy-associated plasma protein A, and nuchal translucency with intrauterine growth restriction and other adverse pregnancy outcomesDavid Krantz NTD Laboratories Inc, 403 Oakwood Road, Huntington Station, NY 11746, USA Am J Obstet Gynecol 191:1452-8. 2004 Maternal weight and ethnic adjustment within a first-trimester Down syndrome and trisomy 18 screening programDavid A Krantz Research Division, NTD Laboratories, Huntington Station, New York 11746, USA Prenat Diagn 25:635-40. 2005 First-trimester maternal dried blood Down syndrome screening marker levels in early pregnancy lossDavid Krantz Research Division, NTD Laboratories, Huntington Station, NY 11746, USA Prenat Diagn 26:1137-41. 2006 Genetic sonography after first-trimester Down syndrome screeningD A Krantz Research Division, NTD Laboratories, Huntington Station, New York 11746, USA Ultrasound Obstet Gynecol 29:666-70. 2007 Combined first-trimester versus second-trimester serum screening for Down syndrome: a cost analysisWilliam Cusick Division of Maternal Fetal Medicine, Stamford Hospital, Conn, USA Am J Obstet Gynecol 188:745-51. 2003 Incorporation of inhibin-A in second-trimester screening for Down syndromeTerrence W Hallahan Obstet Gynecol 102:413; author reply 413-4. 2003 First-trimester screening for trisomy-21 using a simplified method to assess the presence or absence of the fetal nasal boneFrancesco Orlandi Centro di Diagnosi Prenatale, Via Villareale 35, 90141 Palermo, Italy Am J Obstet Gynecol 192:1107-11. 2005 First-trimester Down syndrome screeningTerrence W Hallahan Clin Chem 52:160-1; author reply 161. 2006 Meta-analysis of first trimester Down syndrome screening studies: free beta-human chorionic gonadotropin significantly outperforms intact human chorionic gonadotropin in a multimarker protocolMark I Evans Comprehensive Genetics, and Mt Sinai School of Medicine, New York, NY 10021, USA Am J Obstet Gynecol 196:198-205. 2007
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