[Aneuploid Cohort: Clinical + Research specimens] comparison of aneuploid chromosome mosaicism ratio among affected singletons, two affected twins, and one affected twin, by aneuploidy.

[Aneuploid Cohort: Clinical + Research specimens] comparison of aneuploid chromosome mosaicism ratio among affected singletons, two affected twins, and one affected twin, by aneuploidy.非整倍体队列（Aneuploid Cohort）：临床与研究样本 按非整倍体类型分组，对比受累单胎、两例受累双胞胎及一例受累双胞胎的染色体非整倍体嵌合比例（aneuploid chromosome mosaicism ratio）。