Tetralogy of Fallot, the most common form of a serious congenital heart defect also known as blue baby syndrome, has always been something of a puzzle.
法鲁四联症，也叫婴儿青紫综合症，是最常见的严重的先天性心脏缺损，一直原来原因不明。
Tetralogy of Fallot, the most common form of a serious congenital heart defect also known as blue baby syndrome, has always been something of a puzzle.
法鲁四联症，也叫婴儿青紫综合症，是最常见的严重的先天性心脏缺损，一直原来原因不明。
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