1. The Affiliated Hospital of Qingdao University, Department of Pediatric Surgery, Qingdao, China
2. The Affiliated Hospital of Qingdao University, Department of Pathology, Shenzhen, China
3. The Affiliated Hospital of Qingdao University, Department of Gastroenterology, Qingdao, China
4. Qingdao Municipal Hospital Group, Department of Gastroenterology, Qingdao, China
5. The Affiliated Hospital of Qingdao University, Gastroenterology, Qingdao, China