1. Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, P.R. China
2. Department of Gastrointestinal Surgery, Renmin Hospitai of Wuhan Uiniversity, Wuhan, P.R. China
3. Department of Pulmonary and Critical Care Medicine, The Second Xiangya Hospital, Central South University, Respiratory Disease Research Institute of Hunan Province, Changsha, P.R. China
4. Department of Pulmonary and Critical Care Medicine, Lung Cancer Treatment Center, West China Hospital, Sichuan University, Chengdu, P.R. China