探讨山东省围产儿出生缺陷的危险因素，为提高出生人口素质提供参考依据。
To investigate the possible risk factors of perinatal birth defects in Shandong province.
产前筛查是指通过经济、便捷、无创伤的方法，查找出某些严重病症的高危个体，从而提高出生人口素质。
Prenatal screen means find out high-risk individuals of certain serious diseases through economical, convenient and noninvasive methods, thereby improving the quality of new-born population.
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