1. China-Japan Friendship Hospital, National Center for Respiratory Medicine, Institute of Clinical Medical Sciences, Beijing, China; Chinese Academy of Medical Sciences, Institute of Respiratory Medicine, Beijing, China
2. Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China; National Center for Respiratory Medicine, Beijing, China; Chinese Academy of Medical Sciences, Institute of Respiratory Medicine, Beijing, China
3. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China; National Center for Respiratory Medicine, Beijing, China; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences, Beijing, China
4. Department of Pulmonary and Critical Care Medicine, Shanxi Bethune Hospital, Taiyuan, China
5. Department of Pulmonary and Critical Care Medicine, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China
6. Department of Pulmonary and Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
7. Department of Pulmonary and Critical Care Medicine, Guizhou Provincial People’s Hospital, Guiyang, China
8. Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
9. Department of Pulmonary and Critical Care Medicine, First Hospital of China Medical University, Shenyang, China
10. State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Diseases, Guangzhou Institute of Respiratory Diseases, First Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
11. Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
12. State Key Laboratory of Biotherapy of China and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
13. Beijing Key Laboratory of Respiratory and Pulmonary Circulation Disorders, Department of Pulmonary and Critical Care Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China; Beijing Institute of Respiratory Medicine, Beijing, China
14. Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing, China
15. Department of Respiratory and Critical Care Medicine, Beijing Hospital, Beijing, China; National Center of Gerontology, Beijing Hospital, Beijing, China
16. Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Institute of Basic Medical Sciences, Beijing, China
17. National Center of Gerontology, Beijing Hospital, Beijing, China
18. Center for Clinical Epidemiology and Evidence-based Medicine, Beijing Children’s Hospital, Capital Medical University, National Center for Children’s Health, Beijing, China
19. Tobacco Medicine and Tobacco Cessation Center, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences, Beijing, China; National Clinical Research Center for Respiratory Diseases, Beijing, China; WHO Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, Beijing, China
20. Department of Stomatology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China
21. Department of Epidemiology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China; Beijing Institute of Respiratory Medicine, Beijing, China
22. Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA
23. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, P. R. China