1. Department of Emergency Medicine, The Affiliated Hospital of Qingdao University, West Coast Hospital, Huangdao, Shandong, China
2. Department of Operating Room, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Department of Gastroenterology, The Affiliated Hospital of Qingdao University, West Coast Hospital, Huangdao, Shandong, China