1 Department of Gastroenterology and Hepatology, Xiamen Branch of Zhongshan Hospital, Fudan University, Xiamen, Fujian, China.
2 Department of Gastroenterology and Hepatology, Xiamen Branch of Zhongshan Hospital, Fudan University, Xiamen, Fujian, China; Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai, China.
3 Endoscopic Center, Department of Gastroenterology and Hepatology, Xiamen Branch of Zhongshan Hospital, Fudan University, Xiamen, Fujian, China.