1. Department of Public Health, Graduate School of Medicine The University of Tokyo Bunkyo‐ku Tokyo Japan
2. Department of Health Services Research, Graduate School of Medicine The University of Tokyo Bunkyo‐ku Tokyo Japan
3. Department of Clinical Epidemiology and Health Economics, School of Public Health The University of Tokyo Bunkyo‐ku Tokyo Japan
4. Department of Health Crisis Management National Institute of Public Health Wako‐shi Saitama Japan