1. Department of Anesthesiology, The 960th Hospital of Joint Logistics Support Force of Chinese People’s Liberation Army, Jinan, Shandong 250031, China
2. Department of Anesthesiology, Shandong Cancer Hospital, Shandong Cancer Hospital and Institute Affiliated to Shandong First Medical University (Shandong Academy of Medical Science), Jinan, Shandong 250117, China