1. Department of Critical Care Medicine, Second People's Hospital of Yibin City, Yibin, Sichuan, China (mainland)
2. Department of Critical Care Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China (mainland)
3. Department of Anesthesiology, North Sichuan Medical College, Nanchong, Sichuan, China (mainland)
4. Department of Preventive Medicine, North Sichuan Medical College, Nanchong, Sichuan, China (mainland)
5. Department of Critical Care Medicine, West China-Guang’an Hospital, Sichuan University, Guangan, Sichuan, China (mainland)
6. Department of Critical Care Medicine, Dazhou Central Hospital, Dazhou, Sichuan, China (mainland)
7. Department of Critical Care Medicine, Second People's Hospital of Neijiang City, Neijiang, Sichuan, China (mainland)
8. Department of Critical Care Medicine, First People's Hospital of Zigong City, Zigong, Sichuan, China (mainland)
9. Department of Critical Care Medicine, First People's Hospital of Yibin City, Yibin, Sichuan, China (mainland)