Methods: The pol ymerase chain reaction (PCR) was used to detect an insertion/deletion (I/D) poly morphism of ACE gene in its sixteen intron, then genotype and allele frequencies were calculated.

• 方法：应用聚合酶链式反应(PCR)检测ACE基因第16内含子I/D多态性，并计算基因型和等位基因频率。