术后训练时，一批只刺激术侧皮肤、另一批只刺激对侧皮肤（或者拽耳朵）。可做到双盲。
B医院现在的情况是，术后训练时刺激术侧皮肤，尿动力测试时两侧轮流刺激做对比。
Primary Outcome Measures:
* Reproducible bladder contraction [ time frame: 6 to 24 months post procedure ] [ designated as safety issue: yes ]
The primary aim of this study is reproducible bladder contraction of 15cm/H20 or more with scratching the cutaneous dermatome and no significant contraction with stimulation of the non-operated side.