1 State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Fujian, People's Republic of China.
2 Xiamen Centre for Disease Control and Prevention, Xiamen City, Fujian Province, People's Republic of China.
3 Respiratory Department, Shanghai General Hospital, Shanghai, People's Republic of China.
4 Medical College, Xiamen University, Xiamen City, Fujian Province, People's Republic of China.
5 State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, Laboratory Department, Xiang'an Hospital of Xiamen University, Xiamen, Fujian, People's Republic of China.