单位：上海第二医科大学附属瑞金医院康复科、北京假肢厂。
SETTING:Department of Rehabilitation Medicine, the Affiliated Ruijin Hospital of Shanghai Second Medical University and Beijing Artificial Limb Factory.
上海第二医科大学附属仁济医院麻醉科。
SETTING Department of Anesthesia of Renji Hospital Affiliated to Shanghai Second Medical Scientific University.
方法：实验在上海第二医科大学附属仁济医院完成。
METHODS: the experiment was completed in the Renji Hospital affiliated to Shanghai Second Medical Unviersity.
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