1. Graduate Institute of Medical Sciences, National Defense Medical Center, Taiwan
2. Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, Taiwan
3. Section of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital and National Yang-Ming University, Taiwan
4. Division of Clinical Research, National Health Research Institutes, NDMC, Min-Chuan East Rd, Neihu, Taipei, Taiwan