1. Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
2. Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China
3. Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli, Taiwan, Republic of China
4. Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei, Taiwan, Republic of China
5. Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan, Republic of China