1. Department of Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
2. Department of Gastroenterology, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
3. Department of Pathology, The Norwegian Radium Hospital, Oslo University Hospital, University of Oslo, Montebello, Oslo, Norway
4. Department of Pathology, Institute for Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
5. Department of Surgery, The Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
6. Department of Pathology, Capital Medical University, Beijing, China
7. Department of Oncology, Henan Academy of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan Province, China
8. Department of Urology Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, Henan, China