1. Department of Anesthesiology, First Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei, China (mainland)
2. Department of Joint Surgery, Jizhong Energy Xingtai Mig General Hospital, Xingtai, Hebei, China (mainland)
3. Department of Zoology and Physiology, University of Wyoming, Laramie, USA, WY
4. Department of Anesthesiology, Beijing YouAn Hospital, Capital Medical University, Beijing, China (mainland)