1. Department of Prehospital Emergency, Affiliated Hospital of Jining Medical University, Jining, Shandong, P. R. China
2. Department of Critical Care Medicine, Affiliated Hospital of Jining Medical University, Jining, Shandong, P. R. China
3. Department of Emergency Intensive Care Unit, Affiliated Hospital of Jining Medical University, Jining, Shandong, P. R. China
4. Emergency Internal Medicine Ward, Affiliated Hospital of Jining Medical University, Jining, Shandong, P. R. China
5. Department of Nursing, Affiliated Hospital of Jining Medical University, Jining, Shandong, P. R. China.