| 摘要 |
Infertility is a common health problem that affects 10-15% of couples of reproductive age. In the United States alone in the year 2006, approximately 140,000 cycles of in vitro fertilization (IVF) were performed. This resulted in the culture of more than a million embryos annually with variable, and often ill-defined, potential for implantation and development to temi. The live birth rate, per cycle, following IVF was just 29%, while on average 30% of live births resulted in multiple gestations. Multiple gestations have well-documented adverse outcomes for both the mother and fetuses, such as miscarriage, preterm birth, and low birth rate. |
