1. Department of Anesthesiology, Xianyang Hospital of Yan’an University, Xianyang, Shaanxi, China (mainland)
2. Department of First Anesthesiology and Surgery, Affiliated Hospital of Shaanxi University of Traditional Chinese Medicine, Xianyang, Shaanxi, China (mainland)
3. Department of Anesthesiology, The Fifth Medical Center of PLA General Hospital, Beijing, China (mainland)