1. Department of Endoscopy, Sun Yat‑sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China
2. Department of Interventional Radiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
3. Department of Epidemiology, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
4. Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China