Affiliation: | 1. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Peking University Health Science Center, Beijing, China Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, P.R. China National Center for Respiratory Medicine, Beijing, China Institute of Respiratory Medicine, Chinese Academy of Medical Sciences, Beijing, China National Clinical Research Center for Respiratory Diseases, WHO Collaborating Centre for Tobacco Cessation and Respiratory Diseases Prevention, Beijing, China;2. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, P.R. China National Center for Respiratory Medicine, Beijing, China Institute of Respiratory Medicine, Chinese Academy of Medical Sciences, Beijing, China National Clinical Research Center for Respiratory Diseases, WHO Collaborating Centre for Tobacco Cessation and Respiratory Diseases Prevention, Beijing, China;3. Department of Critical Care Medicine, Qilu Hospital of Shandong University (Qingdao), Qingdao, China;4. Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China;5. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, P.R. China |