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 Liver Surgery; Sun Yat-sen University Cancer Center; 651 Dongfeng Road East Guangzhou 510060 Guangdong P. R. China
3. Department of Public Health; Sun Yat-sen University; Guangzhou 510080 Guangdong P. R. China
4. Department of Molecular Medicine California Campus; The Scripps Research Institute; 10550, North Torrey Pines Road La Jolla CA 92037 USA