而部分原因要归结为——遗传：有30种不同的基因可增高克罗恩病的易感性，但也并非每一个拥有这种基因的人就会得克罗恩病。
And heredity is partly to blame: some 30 different genes enhance susceptibility. But not everyone who has the genes gets Crohn's.
虽然克罗恩病比乳糜泻少见，但是克罗恩病有更严重的症状，因为它可以影响整个消化道。
Crohn's disease is much less common but can be accompanied by more severe symptoms as it can affect the whole gastrointestinal tract.
克罗恩病相关瘘的患者中有33%成功治愈，而未患克罗恩病的患者有75%成功治愈。
Thirty-three percent of the Crohn's disease-associated fistulas successfully healed; 75% without Crohn's successfully healed.
克罗恩病相关瘘的患者中有33%成功治愈，而未患克罗恩病的患者有75%成功治愈。
Thirty-three percent of the Crohn's disease-associated fistulas successfully healed; 75% without Crohn's successfully healed.
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