1 Advanced Medical Emergency and Critical Care Center, Yamaguchi University Hospital, Ube, Yamaguchi, Japan. Electronic address: koga-ygc@umin.ac.jp.
2 Acute and General Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, Japan.
3 Advanced Medical Emergency and Critical Care Center, Yamaguchi University Hospital, Ube, Yamaguchi, Japan.
4 Advanced Medical Emergency and Critical Care Center, Yamaguchi University Hospital, Ube, Yamaguchi, Japan; Acute and General Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, Japan.