There are few or no symptoms early in the disease and no effective screening tests.
对于这些疾病早期很少或没有症状，并且无有效的筛查试验。
Colon cancer screening: Is there an easier, effective way?
结肠镜筛查有没有更简单、有效地方法？
Small bowel enteroclysis is an effective screening test.
小肠钡灌检查可作为小肠克罗恩病的有效筛查手段。
Small bowel enteroclysis is an effective screening test.
小肠钡灌检查可作为小肠克罗恩病的有效筛查手段。
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