1. Department of Emergency and Critical Care Medicine, Nippon Medical School Tama Nagayama Hospital
2. Health Services and Systems Research, Duke-NUS Medical School
3. Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo
4. Department of Neurosurgery, St. Luke's International Hospital
5. Department of Neurosurgery, Tominaga Hospital
6. Department of Neurosurgery, Nippon Medical School Chiba Hokusoh Hospital
7. Department of Emergency and Critical Care Medicine, Nippon Medical School