1. Department of Gastrointestinal Surgery, Yantai Yuhuangding Hospital, Yantai, Shandong, China (mainland)
2. Department of Oncology, Yantai Yuhuangding Hospital, Yantai, Shandong, China (mainland)
3. Department of Endocrinology, Yantai Yuhuangding Hospital, Yantai, Shandong, China (mainland)
4. Inpatient Area Of Genenral Surgery Department II, The First People`s Hospital Of Taian, Taian, Shandong, China (mainland)