1 Inner Mongolia Medical University, Department of Pain, Affiliated Hospital of Inner Mongolia Medical University, Huhehot North Street, Inner Mongolia, 010050, China.
2 Inner Mongolia Medical University, Health Management Center, Affiliated Hospital of Inner Mongolia Medical University, Huhehot North Street, Inner Mongolia, 010050, China.
3 Inner Mongolia Medical University, Department of Anesthesiology, Affiliated Hospital of Inner Mongolia Medical University, Huhehot North Street, Inner Mongolia, 010050, China.
4 Inner Mongolia Medical University, Department of Nursing, Affiliated Hospital of Inner Mongolia Medical University, Huhehot North Street, Inner Mongolia, 010050, China. Electronic address: hongtaoguonm@163.com.