Institution: | 1. School of clinical medicine, Weifang Medical University, Weifang, Shandong, China;2. Department of Gastroenterology, Peking University Third Hospital, Beijing, China;3. Department of Electrophysiology, The Affiliated Hospital of Weifang Medical College, Weifang, Shandong, China;4. Department of Gastroenterology, The Affiliated Hospital Of Qingdao University, Qingdao, Shandong, China |