1 Tsinghua University School of Medicine, Beijing, China.
2 Beijing University of Chinese Medicine, Beijing, China.
3 Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, National Clinical Research Center for Respiratory Diseases, China-Japan Friendship Hospital, Beijing 100029, China.
4 Institute of Respiratory Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
5 Tsinghua University-Peking University Joint Center for Life Sciences, Beijing, China.
6 Department of Respiratory Medicine, Capital Medical University, Beijing, China.