1. Department of Anesthesiology, General Hospital of Western Theater Command, Chengdu, Sichuan, China (mainland)
2. Outpatient Department, General Hospital of Western Theater Command, Chengdu, Sichuan, China (mainland)
3. College of Medicine, Southwest Jiaotong University, Chengdu, Sichuan, China (mainland)
4. Department of Cardiology, General Hospital of Western Theater Command, Chengdu, Sichuan, China (mainland)