1. Emergency Center, Suining Central Hospital, Suining, Sichuan, P. R. China
2. Department of Emergency Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, P. R. China
3. Respiratory Center, Suining Central Hospital, Suining, Sichuan, P. R. China
4. Hepatobiliary Pancreatic Splenic Surgery, Ya’an People’s Hospital, Ya’an, Sichuan, P. R. China