1. Department of Pulmonary and Critical Care Medicine, Peking University China-Japan Friendship School of Clinical Medicine , Beijing 100029 , China
2. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital , Beijing 100029 , China
3. Department of Pulmonary and Critical Care Medicine, Beijing Jishuitan Hospital , Beijing 100035 , China
4. Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100730 , China
5. National Center for Respiratory Medicine , Beijing 100029 , China
6. Institute of Respiratory Medicine, Chinese Academy of Medical Sciences , Beijing 100029 , China
7. National Clinical Research Center for Respiratory Diseases , Beijing 100029 , China
8. Department of Pulmonary and Critical Care Medicine, Beijing Anzhen Hospital , Beijing 100029 , China
9. Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College , Beijing 100730 , China
10. National Heart and Lung Institute (NHLI), Imperial College London, Hammersmith Hospital , London W12 0HS , UK