1. Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, China (mainland)
2. Department of Central Laboratory, Tai’an Central Hospital, Tai’an, Shandong, China (mainland)
3. Department of Endoscopy Center, Tai’an Central Hospital, Tai’an, Shandong, China (mainland)
4. Department of Pathology, Tai’an Central Hospital, Tai’an, Shandong, China (mainland)
5. Department of Endocrinology, Tai’an Central Hospital, Tai’an, Shandong, China (mainland)
6. Department of Gastroenterology, Tai’an Central Hospital, Tai’an, Shandong, China (mainland)