1. Department of Respiratory and Critical Care Medicine, Peking University People's Hospital, Beijing, China.
2. Laboratory Medicine, Peking University People's Hospital, Beijing, China.
3. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
4. Department of Respiratory Medicine, Fujian Provincial Hospital, Fuzhou, China.
5. Department of Respiratory Medicine, The Second Affiliated Hospital to Dalian Medical University, Dalian, China.