1. Department of Emergency Medicine Japanese Red Cross Okayama Hospital 2‐1‐1 Aoe, Kita ward Okayama Okayama7008607Japan
2. Department of Emergency, Critical Care, and Disaster Medicine Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences 2‐5‐1 Sikatatyo Okayama Okayama7008558Japan