1 Department of Respiratory and Critical Care Medicine, Guangyuan Central Hospital Affiliated to North Sichuan Medical College, Guangyuan, China.
2 Department of Respiratory and Critical Care Medicine, Central Hospital of Bazhong, Bazhong, China.
3 Science and Technology Innovation Center, Guangyuan Central Hospital Affiliated to North Sichuan Medical College, Guangyuan, China.
4 Department of Respiratory and Critical Care Medicine, Guangyuan Central Hospital Affiliated to North Sichuan Medical College, Guangyuan, China - cgscshiping@163.com.