1. Department of Thoracic Oncology II, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing 100142 P. R. China
2. Beijing Genecast Biotechnology Co.; Beijing 100191 P. R. China
3. Institute of Infectious Diseases, Beijing Ditan Hospital; Capital Medical University; Beijing 100011 P. R. China