Institution: | 1.Second Department of Radiotherapy, Yantai Hill Hospital, Yantai, 264003, Shandong, China ;2.Department of Gastroenterology, Weifang People’s Hospital, Weifang, 261000, Shandong, China ;3.Department of Gastroenterology, Shengli Oilfield Central Hospital, Dongying, 257034, Shandong, China ;4.First Department of Surgery, Yantai Tao Cun Central Hospital, Yantai, 265301, Shandong, China ; |