1. Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
2. School of Medicine, Chung Shan Medical University, Taichung, Taiwan
3. Department of Microbiology and Immunology, School of Medicine, China Medical University, Taichung, Taiwan
4. Division of Infectious Diseases, Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
5. Division of Respiratory Therapy, Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
6. Department of Microbiology and Immunology, School of Medicine, Chung Shan Medical University, Taichung, Taiwan
7. Central Region Laboratory, Center for Diagnostics and Vaccine Development, Centers for Disease Control, Ministry of Health and Welfare, Taipei, Taiwan