1. Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
2. Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou, Fujian, People's Republic of China
3. Department of Pathology, Fujian Provincial Cancer Hospital, Teaching Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China
4. Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
5. Department of Gastrointestinal Surgery, Fujian Provincial Hospital, Teaching Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China
6. Department of Radiology, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, People's Republic of China
7. Department of Endoscopy Center, Fujian Provincial Hospital, Teaching Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China