Jing Feng is a professor and chief at the Division of Pulmonary and Critical Care Medicine and Department of Interventional Pulmonology, Tianjin Medical University General Hospital, Tianjin, China.Xin Li is a chief physician of Department of Pathology, Tianjin Haihe Hospital, Tianjin Institute of Respiratory Diseases, Tianjin, China. Pei Li is physician in chief of Department of Respiratory, Taikang Xianlin Drum Tower Hospital, Nanjing University School of Medicine, Nanjing , China. Qiang Li is the director of Department of Respiratory Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China. Yi Shi is the chief physician of Department of Respiratory and Critical Care Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China.