1. Chemotherapy Department, Cancer Center, the University of Sun Yat-Sen, Guangzhou, Guangdong, China
2. State Key Laboratory of Oncology in South China, Guangzhou, Guangdong, China
3. The Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, Henan, China
4. Cancer Research Center, Guangdong Medical College, Dongguan, China