Ryuichi Nishi1, Shinji Nakahara2, Yasufumi Miyake1, Tetsuya Sakamoto1. 1. Department of Emergency Medicine, Teikyo University School of Medicine, Tokyo, Japan. 2. Department of Emergency Medicine, Teikyo University School of Medicine, Tokyo, Japan; Graduate School of Health Innovation, Kanagawa University of Human Services, Kawasaki, Japan. Electronic address: snakahara-tky@umin.net.