1 Department of Gastroenterology, Xiang'an Hospital of Xiamen University, 2000 Xiang'an West Road, Xiamen, Fujian, People's Republic of China.
2 Department of Medical Engineering, The 305 Hospital of PLA, Beijing, China.
3 State Key Laboratory of Cancer Biology and National Clinical Research Center for Digestive Diseases, Xijing Hospital of Digestive Diseases, Air Force Medical University, Xi'an, 710032, China.
4 Department of Gastroenterology, 175 Hospital of PLA, Affiliated Southeast Hospital of Xiamen University, Zhangzhou, 363000, Fujian Province, China. zmqing8084@sina.com.
5 Department of Gastroenterology, Xiang'an Hospital of Xiamen University, 2000 Xiang'an West Road, Xiamen, Fujian, People's Republic of China. lxuhelen@163.com.