1. Department of Pain Medicine, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110000, P.R. China
2. Department of Scientific Research, The Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121000, P.R. China
3. Department of Anesthesiology, The Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121000, P.R. China