1. Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
2. Department of Psychiatry, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
3. Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
4. The Medical Department of the Emergence Center of Xi'an, Xi'an, China.