1. Department of Neurosurgery, Akita University Graduate School of Medicine, Akita, Akita, Japan
2. Department of Neurosurgery, Akita Cerebrospinal and Cardiovascular Center, Akita, Akita, Japan
3. Department of Neurosurgery, Akita Redcross Hospital, Akita, Akita, Japan
4. Department of Emergency and Critical Care Medicine, Akita University Graduate School of Medicine, Akita, Akita, Japan
5. Department of Emergency and Critical Care Center, Akita Red Cross Hospital, Akita, Akita, Japan
6. Akita City Fire Department Headquarters, Akita, Akita, Japan