1. Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangzhou 510060 Guangdong P. R. China
2. Department of Colorectal Surgery; Sun Yat-sen University Cancer Center; 651 Dongfeng Road East Guangzhou 510060 Guangdong P. R. China
3. Department of Radiation Oncology; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
4. Department of Gynecological Oncology, Sun Yat-sen Memorial Hospital; Sun Yat-sen University; Guangzhou 510060 Guangdong P. R. China