1 Department of Endoscopy, Shengjing Hospital, Medical University, Shenyang, Liaoning Province, China.
2 Department of Gastroenterology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
3 Department of Gastroenterology, Changhai Hospital, Second Military Medical University, Shanghai, China.
4 Department of Gastroenterology, Peking Union Medical College Hospital, Beijing, China.
5 Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, China.
6 Department of Endoscopy, Chinese Academy of Medical Sciences, Beijing, China.
7 Department of Gastroenterology, The First Affiliated Hospital of Zhejiang University, Hangzhou, Zhejiang Province, China.
8 Department of Gastroenterology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.
9 Department of Gastroenterology, Huashan Hospital, Fudan University, Shanghai, China.
10 Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China.
11 Department of Endoscopy, Shanghai Jiao Tong University, Shanghai, China.
12 Department of General Surgery, Peking University Hospital, Beijing, China.
13 Department of Gastroenterology, Tianjin Nankai Hospital, Tianjin, China.
14 Department of Gastroenterology, The First People's Hospital of Hangzhou, Nanjing Medical University, Hangzhou, Zhejiang Province, China.
15 Department of Gastroenterology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu Province, China.
16 Department of Endoscopy, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, China.
17 Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong Province, China.
18 Department of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China.