1. Division of Infectious Diseases Department of Internal Medicine National Cheng Kung University Hospital Tainan Taiwan
2. Division of Geriatrics and Gerontology Department of Internal Medicine National Cheng Kung University Hospital Tainan Taiwan
3. Center of Infection Control National Cheng Kung University Hospital Tainan Taiwan
4. Department of Medicine National Cheng Kung University Medical College Tainan Taiwan
5. Department of Emergency Medicine National Cheng Kung University Hospital Tainan Taiwan
6. Division of Infectious Diseases, National Institute of Infectious Diseases and Vaccinology National Health Research Institutes Tainan Taiwan
7. Division of Infectious Diseases, National Institute of Infectious Diseases and Vaccinology National Health Research Institutes Zhunan Taiwan