1. Department of Emergency and Critical Care Medicine; Chiba University Graduate School of Medicine; Chiba Chiba Japan
2. Department of Neurology; Chiba University Graduate School of Medicine; Chiba Chiba Japan
3. Department of Emergency and Critical Care Medicine; Tokyo Women's Medical University Yachiyo Medical Center; Yachiyo Chiba Japan
4. Office of Medical Education; Chiba University Graduate School of Medicine; Chiba Chiba Japan