1 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe road, Erqi district, Zhengzhou, 450000, Henan, China.
2 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, No.1 Jianshe road, Erqi district, Zhengzhou, 450000, Henan, China. bingrongliuzdyfy@126.com.