It was the first heritable disorder described in cardiovascular system and the commonest genetic cardiac disease with a prevalence of 0.2% in general population.

其人群发病率约0.2%，是心血管系统最早发现且最常见的遗传性疾病。

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A trait or disease is called heritable if monozygotic twins are more similar to each other than dizygotic twins.

如果一种性状或疾病在同卵双胞胎中的同时发生的概率高于异卵双胞胎，那么这种性状或疾病是“可遗传的”。

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The twin rule of pathology states that any heritable disease will be more concordant (that is, more likely to be jointly present or absent) in identical twins than in non-identical twins and, in turn, will be more concordant in non-identical twins than in non-siblings.

ECONOMIST: Twin studies, genetics and the environment