1. Department of Emergency and Critical Care Medicine Keio University School of Medicine Tokyo Japan
2. Department of Anesthesiology and Critical Care Medicine Nagoya Daini Red Cross Hospital Nagoya Japan
3. Department of Emergency and Critical Care Medicine Graduate School of Medicine University of the Ryukyus Okinawa Japan
4. Department of Intensive Care Medicine Sapporo Medical University School of Medicine Sapporo Japan
5. Center for General Medicine Education Keio University School of Medicine Tokyo Japan