1. State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, Guangdong Province 510060, P. R. China
2. Department of Medical Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, Guangdong Province 510060, P. R. China
3. Department of Oncology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong Province 510080, P. R. China