1. Centre for Diseases Prevention and Control of Eastern Theater, Nanjing, China
2. Binzhou Medical University, Yantai, China
3. Air Force Hospital of Eastern Theater, Nanjing, China
4. The First Affiliated Hospital of Nanjing Medical University (Jiangsu Province Hospital), Nanjing, China
5. Department of Respiratory and Critical Care Medicine, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China