1. Taiwan Centers for Disease Control, Taipei, Taiwan
2. Department of Infectious Disease Epidemiology, Imperial College, London, UK
3. Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Institute of Epidemiology and Preventive Medicine, College of Public Health,
National Taiwan University, Taipei, Taiwan
4. Division of Epidemiology and Biostatistics, School of Public Health, Georgia State University, Atlanta, Georgia, USA
5. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan