1. Department of Intensive Care, The Second People's Hospital of Zhangye, Zhangye City, China
2. The Second Department of Orthopaedics, Zhangye People's Hospital, Hexi University, Zhangye City, China
3. Gansu Province, Lanzhou University, Lanzhou City, China
4. Department of Cardiac Intensive Care Unit, Lanzhou University Second Hospital, Lanzhou,China