The findings in asymptomatic control group included 2 cases of ileal polyp (2.50%), 2 cases of angiodysplasia (2.50%), 1 case of intestinal erosion (1.25%), and 1 case of jejunal ulcer (1.25%).

无消化道症状的中发现：回肠息2(2.50%)，肠血管畸2(2.50%)，肠黏膜糜烂1(1.25%)，空肠孤立性溃疡1(1.25%)。