1. First Clinical Medical School, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
2. Department of Medical Ethics Committee, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
3. Department of Thoracic Oncology Radiation, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
4. Department of Radiation Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, P.R. China