1. Department of Respiratory and Critical Care Medicine, Peking University Third Hospital
2. School of Basic Medical Sciences, Peking University
3. Department of Respiratory and Critical Care Medicine, Peking University Shougang Hospital
4. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Institute of Respiratory Health
5. Department of Respiratory and Critical Care Medicine, The First Hospital of China Medical University
6. Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University
7. Department of Respiratory and Critical Care Medicine, Shanxi Bethune Hospital
8. Department of Respiratory and Critical Care Medicine, Tibet Autonomous Region People’s Hospital
9. Clinical Epidemiology Research Center, Peking University Third Hospital