1 Department of Emergency Medicine and Critical Care Medicine, Tochigi Prefectural Emergency and Critical Care Centre, Imperial Foundation Saiseikai Utsunomiya Hospital, 911-1 Takebayashimachi, Utsunomiya, 321-0974 Tochigi, Japan. Electronic address: yudai.i0213@gmail.com.
2 Department of Emergency Medicine and Critical Care Medicine, Tochigi Prefectural Emergency and Critical Care Centre, Imperial Foundation Saiseikai Utsunomiya Hospital, 911-1 Takebayashimachi, Utsunomiya, 321-0974 Tochigi, Japan.