1. Department of Anesthesiology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangdong, China
2. Department of Anesthesiology, Fifth Medical Center of Chinese Pla General Hospital, Beijing, China
3. Department of Anesthesiology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangdong, China
4. Department of Medical Administration, The Eleventh People’s Hospital of Guangzhou, Guangdong, China