1. Department of Respiratory Medicinethe Second Affiliated Hospital of Nanjing Medical University 210011 Nanjing Jiangsu China
2. Department of Infectious Diseasesthe Second Affiliated Hospital of Nanjing Medical University 210011 Nanjing Jiangsu China
3. Jiangsu Provincial Center for Disease Control and Prevention 210009 Nanjing Jiangsu China
4. Department of Respiratory Medicinethe First People’s Hospital of Kunshan 215300 Kunshan Jiangsu China
5. Department of Respiratory MedicineSir Run Run Hospital 211100 Nanjing Jiangsu China