Department of Gastroenterology, Qingdao Municipal Hospital affiliated to Qingdao University, Qingdao 266011, Shandong Province, China
Qingdao Key Laboratory of Digestive Diseases, Qingdao Municipal Hospital, Qingdao 266011, Shandong Province, China
Department of Gastroenterology, Affiliated Hospital of Qingdao University Medical College, Qingdao 266003, Shandong Province, China