1. Division of Infectious Diseases Department of Medicine Taipei Veterans General Hospital Taipei Taiwan
2. Institute of Epidemiology and Preventive Medicine National Taiwan University Taipei Taiwan
3. Department of Public Health, Environments and Society Faculty of Public Health and Policy School of Hygiene and Tropical Medicine London United Kingdom
4. Nursing Department Taipei Veterans General Hospital Taipei Taiwan
5. Department of Infection Control Taipei Veterans General Hospital Taipei Taiwan
6. Institute of Public Health School of Medicine National Yang‐Ming University Taipei Taiwan
7. Division Microbiology Department of Pathology and Laboratory Medicine Taipei Veterans General Hospital Taipei Taiwan
8. School of Medicine National Yang‐Ming University Taipei Taiwan