1. Department of Clinical Research the Affiliated Hospital of Guangdong Medical University Zhanjiang China
2. Department of Pulmonary and Critical Care Medicine the Affiliated Hospital of Guangdong Medical University Zhanjiang China
3. Department of Infectious Disease the Affiliated Hospital of Guangdong Medical University Zhanjiang China
4. School of Public Health Guangdong Medical University Zhanjiang China
5. Department of Clinical Research the Affiliated Hospital of Ji'nan University Guangzhou China