title: On perinatal risk precision in the first trimester of pregnancy in relation to nuchal translucency and the biochemical analysis of maternal serum.
mesh_terms: D001774:Blood Chemical Analysis / Q000592:standards; D002568:Certification / Q000379:methods / Q000458:organization & administration; D005260:Female; D005858:Germany; D006801:Humans; D009132:Muscles; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000592:standards*; D012015:Reference Standards; D018570:Risk Assessment; D016216:Ultrasonography, Prenatal / Q000592:standards