1. Section of Infectious Diseases, Taipei City Hospital, Taipei City Government, Taipei, Taiwan; Division of Global Public Health, University of California San Diego, San Diego, CA, USA
2. Division of Global Public Health, University of California San Diego, San Diego, CA, USA
3. Department of Disease Control and Prevention, Taipei City Hospital, Taipei City Government, Taipei, Taiwan
4. Section of Infectious Diseases, Taipei City Hospital, Taipei City Government, Taipei, Taiwan