A 29 year old woman with a family history of hemophilia B asked for prenatal diagnosis in the 8th week of pregnancy.
一例有血友病B家族史的29岁孕妇，于妊娠8周时要求对胎儿进行诊断。
A 29 year old woman with a family history of hemophilia B asked for prenatal diagnosis in the 8th week of pregnancy.
一例有血友病B家族史的29岁孕妇，于妊娠8周时要求对胎儿进行诊断。
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