1. School of Population Medicine and Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. State Key Laboratory of Respiratory Health and Multimorbidity, Beijing, China
3. Key Laboratory of Pathogen Infection Prevention and Control, Ministry of Education, Peking Union Medical College, Beijing, China
4. Beijing Centre for Disease Prevention and Control, Beijing Research Centre for Preventive Medicine, Beijing, China
5. Xicheng District Centre for Diseases Control and Prevention, Beijing, China
6. Beijing Municipal Health Commission, Beijing, China
7. Capital Medical University, Beijing, China