1 Department of Emergency Medicine, National Hospital Organization Mito Medical Center, 280 Sakuranosato Ibaraki-Machi Higashi-Ibaraki-Gun, Ibaraki, 311-3117, Japan. tsutsumi.yusuke.84x@st.kyoto-u.ac.jp.
2 Human Health Science, Kyoto University Graduate School of Medicine, Kyoto, Japan. tsutsumi.yusuke.84x@st.kyoto-u.ac.jp.
3 Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Isehara, Japan.
4 Department of Clinical Epidemiology and Health Economics, School of Public Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
5 Clinical Research Promotion Center, The University of Tokyo Hospital, Tokyo, Japan.