World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, Government of the People's Republic of China - Center of Respiratory Medicine, Government of the People's Republic of China - Center of Respiratory Medicine, China Medical University - Department of Respiratory and Critical Care Medicine, Baiyin First People's Hospital of Gansu Province - Department of Respiratory and Critical Care Medicine, Huazhong University of Science and Technology - Department of Pulmonary and Critical Care Medicine, Shanghai Jiao Tong University (SJTU) - Department of Respiratory and Critical Care Medicine, Harbin Medical University - Department of Respiratory Medicine, Guangxi Medical University - Department of Respiratory and Critical Care Medicine, Capital Medical University - Department of Respiratory and Critical Care Medicine, Henan Provincial People's Hospital - Department of Pulmonary and Critical Care Medicine, Government of the People's Republic of China - Beijing Hospital, Fujian Medical University - Department of Pulmonary and Critical Care Medicine, Chongqing Medical University - Department of Respiratory and Critical Care Medicine, Shaanxi Hospital of Traditional Chinese Medicine - 3rd Department of Acupuncture and Moxibustion, Qingdao University - Affiliated Hospital, Guangzhou Medical University - Department of Respiratory Medicine, The People's Hospital of Inner Mongolia Autonomous Region - Department of Respiratory and Critical Care Medicine, Hunan Provincial People’s Hospital - Department of Respiratory and Critical Care Medicine, Fujian Medical University - Department of Pulmonary and Critical Care Medicine, Chongqing Medical University - Department of Respiratory and Critical Care Medicine, Wenzhou Medical University - Department of Respiratory Medicine, The Third People's Hospital of Datong City - Department of Respiratory and Critical Care Medicine, Soochow University - Department of Respiratory and Critical Care Medicine, China Medical University - Department of Pulmonary and Critical Care Medicine, Zhengzhou University - Department of Pulmonary and Critical Care Medicine, Chengde Medical College - Department of Respiratory and Critical Care Medicine, Shanxi Medical University - Department of Pulmonary and Critical Care Medicine, China Medical University - Department of Pulmonary and Critical Care Medicine, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, affiliation not provided to SSRN, Imperial College London - National Heart and Lung Institute, University of Oxford, Government of the People's Republic of China - Center of Respiratory Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - State Key Laboratory of Medical Molecular Biology and Independent