1. Medical School of Chinese PLA Beijing China
2. Department of Critical Care Medicine The First Medical Center, Chinese PLA General Hospital Beijing China
3. Department of Emergency The Third Medical Center, Chinese PLA General Hospital Beijing China
4. Department of Emergency The Sixth Medical Center, Chinese PLA General Hospital Beijing China
5. Department of Emergency, Beijing Tongren Hospital Capital Medical University Beijing China
6. Department of Health Statistics Air Force Medical University Xian China
7. Chinese PLA Center for Disease Control and Prevention Beijing China