1 Department of Cardiovascular Medicine, Binzhou Medical University Hospital, Binzhou, Shandong Province, China.
2 Department of Nursing Management, Binzhou Medical University Hospital, Binzhou, Shandong Province, China.
3 Department of Hepatobiliary Surgery, Binzhou Medical University Hospital, Binzhou, Shandong Province, China. Electronic address: byfygdwk_cxf@163.com.