1 Anesthesia Recovery Room, Binzhou Medical University Hospital, Binzhou, China.
2 Anesthesia Recovery Room, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Jinan, China.
3 Medical Research Center, Binzhou Medical University Hospital, Binzhou, China. Electronic address: liuxiuzhen0704@126.com.