Placenta previa, premature rupture of fetalmembrane (PROM), multiple pregnancy and maternal chronic hypertension are the main rlated factors of premature delivery;
新生儿窒息的危险因素有胎儿宫内发育迟缓,母亲孕期并发妊高征和胎儿窘迫。
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The highly vascular fetalmembrane that consists of the fused chorion and allantois found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.
The highly vascular fetalmembrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.