1. Department of Gastroenterology, Yantai Yuhuangding Hospital, #20 Yuhuangding East Road, Zhifu District, Yantai, Shandong 264000, China
2. Department of Internal Medicine, Yantai Yuhuangding Hospital, #20 Yuhuangding East Road, Zhifu District, Yantai, Shandong 264000, China
3. The General and Pediatric Surgery, Yantai Yuhuangding Hospital, #20 Yuhuangding East Road, Zhifu District, Yantai, Shandong 264000, China
4. Department of Medical Oncology, Yantai Yuhuangding Hospital, #20 Yuhuangding East Road, Zhifu District, Yantai, Shandong 264000, China