1. Department of Pathology, the University of Texas MD Anderson Cancer Center, Houston, Texas, USA
2. State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, P.R. China
3. Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, P.R. China
4. Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, P.R. China