1. Department of Thoracic Surgery, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
2. Institute of Immunology of PLA, College of Basic Medical Sciences, The Third Military Medical University, Chongqing 400038, P.R. China
3. Department of Pathogenic Biology, College of Basic Medical Sciences, The Third Military Medical University, Chongqing 400038, P.R. China