1. State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
2. Department of Hepatobiliary and Pancreatic Surgery; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
3. Department of Pathology; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
4. Department of Medical Imaging; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China