1. Department of Biomedical Sciences, National Chung Cheng University, Chia-Yi, Taiwan
2. Department of Microbiology and Immunology, School of Medicine, Chung Shan Medical University, Taichung, Taiwan
3. Department of Public Health, China Medical University, Taichung, Taiwan
4. Department of Microbiology and Immunology, School of Medicine, China Medical University, Taichung, Taiwan
5. Center for Research, Diagnostics, and Vaccine Development, Centers for Disease Control, Ministry of Health and Welfare, Taichung, Taiwan
6. Division of Infectious Diseases, Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
7. Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan