1 Hyogo Emergency Medical Center, 1-3-1 Wakinohamakaigando-ri, Chuo-ku, Kobe, Hyogo 651-0073, Japan.
2 Department of Emergency and Critical Care Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikatacho, Kitaku, Okayama City, Okayama, 700-8558, Japan.