Affiliation: | 1.Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, No 2, East Yinghua Road, Chaoyang District, 100029, Beijing, P. R. China ;2.Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, No 9, Dongdan Santao, Dongcheng District, 100730, Beijing, P. R. China ;3.National Center for Respiratory Medicine, No 2, East Yinghua Road, Chaoyang District, 100029, Beijing, P. R. China ;4.Institute of Respiratory Medicine, Chinese Academy of Medical Sciences, No 2, East Yinghua Road, Chaoyang District, 100029, Beijing, P. R. China ;5.National Clinical Research Center for Respiratory Diseases, No 2, East Yinghua Road, Chaoyang District, 100029, Beijing, P. R. China ;6.WHO Collaborating Centre for Tobacco Cessation and Respiratory Diseases Prevention, No 2, East Yinghua Road, Chaoyang District, 100029, Beijing, P. R. China ; |