1 Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Zhengzhou University, No. 1 Eastern Jianshe Road, Zhengzhou, 450000, People's Republic of China.
2 Department of Gastroenterology and Hepatology, Xinmi First People's Hospital, Zhengzhou, People's Republic of China.
3 Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Zhengzhou University, No. 1 Eastern Jianshe Road, Zhengzhou, 450000, People's Republic of China. fccliud@zzu.edu.cn.