1 Endoscopy Center, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China.
2 Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China.
3 The School of Clinical Medicine, Fujian Medical University, Fuzhou, China.
4 Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China. zjywyq2002@163.com.
5 The School of Clinical Medicine, Fujian Medical University, Fuzhou, China. zjywyq2002@163.com.