1. Department of Critical-Care Medicine, Shandong Provincial Hospital, Shandong University, Jinan 250021, China
2. Department of Critical-Care Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Shandong First Medical University, Jinan 250021, China
3. The Psychiatric Institute, Department of Psychiatry, College of Medicine, University of Illinois at Chicago, 1601 West Taylor Street, Chicago, Illinois 60612, United States