1. Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
2. Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan, Taiwan.
3. Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
4. Division of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan.