1 Department of Gastroenterology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong Province, China.
2 Department of Gastroenterology, Peking University Third Hospital, Beijing, China.
3 Department of Gastroenterology, Union Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei Province, China.
4 Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong Province, China.
5 Department of Gastroenterology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.