1. Department of Clinical Epidemiology and Health Economics School of Public Health The University of Tokyo TokyoJapan
2. TXP Medical Co. Ltd TokyoJapan
3. Department of Public Health Graduate School of Medicine The University of Tokyo TokyoJapan
4. Department of Emergency Medicine Southern Tohoku General Hospital KoriyamaJapan
5. Department of Social Medicine Osaka University Graduate School of Medicine OsakaJapan
6. Department of Emergency Medicine Hitachi General Hospital Hitachi Japan