1. Department of Digestive Interventional Radiology; Xijing Hospital of Digestive Diseases; Fourth Military Medical University; Xi'an; Shaanxi Province; China
2. Department of Medical Statistics; Fourth Military Medical University; Xi'an; Shaanxi Province; China
3. State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases; Fourth Military Medical University; Xi'an; Shaanxi Province; China