1. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China
2. National Clinical Research Center for Respiratory Diseases, Beijing, China
3. Peking University Health Science Center, Beijing, China
4. Capital Medical University, Beijing, China
5. The Graduate School of Peking Union Medical College, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China