1. Department of Gastrointestinal Surgery, Harbin Medical University Cancer Hospital, Harbin Medical University, Harbin, Heilongjiang 150086, China
2. Department of Pathology, Harbin Medical University, Harbin, China
3. Department of Clinical Laboratory, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150086, China
4. Department of Digestive Internal Medicine and Photodynamic Therapy Center, Harbin Medical University Cancer Hospital, Harbin Medical University, Harbin, Heilongjiang 150086, China