1. Department of Anesthesiology, Yan’an University Affiliated Hospital, Yan’an, Shaanxi, 716000, China
2. Department of Anesthesiology, Hotan District People’s Hospital, Hotan, Xinjiang, 848000, China
3. Department of Anesthesiology, Hanzhong Central Hospital, Hanzhong, Shaanxi, 723000, China