1. Division of Thoracic Tumor Multimodality Treatment and Department of Medical Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. West China Medical School, West China Medical Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, P.R. China