1. Department of Anesthesiology, Xichang People’s Hospital, Xichang, China
2. Department of Anesthesiology, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Fuwai Hospital, Peking Union Medical College, Beijing, China
3. Department of Anesthesiology, Baoji High-Tech Hospital, Shaanxi, China
4. Department of Laboratory, Xichang People’s Hospital, Xichang, China.