1 Department of Critical Care Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, China.
2 Department of Hospital Infection Management, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, China.
3 Department of Cardiovascular Medicine, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, China. Electronic address: xiaoqiangtyfy1970@163.com.