Survey of prenatal screening policies in Europe for structural malformations and chromosome anomalies, and their impact on detection and termination rates for neural tube defects and Down's syndrome

欧洲产前筛查政策（包括结构畸形和染色体异常筛查）及其对神经管缺陷和唐氏综合征的检出率和终止妊娠率的影响调查